Give ye ear, and hear my voice; hearken, and hear my speech. Doth the plowman plows all day to sow? Doth, he opens and break the clods of his ground? When he hath made plain the face thereof, doth he not cast abroad the fitches, and scatter the cumin, and cast in the principal wheat and the appointed barley and the rye in their place? For his God doth instruct him to discretion, and doth teach him. Isaiah 28:23-26.
The Lord by wisdom hath founded the earth; by understanding hath he established the heavens. By his knowledge the depths are broken up, and the clouds drop down the dew. My son, let not them depart from thine eyes; keep sound wisdom and discretion; so, shall they be life unto thy soul, and grace to thy neck. Then shall thou walk in thy way safely, and thy foot shall not stumble. When thou liest down, thou shall not be afraid; yea, thou shall lie down, and thy sleep shall be sweet. Proverbs 3:19-24.
Note: God will never give or do anything for a believer to cause pride in him, for that will altogether be like he’s setting him up for destruction: he will not make any in the church to become a super hero as the result of any special spiritual gift which does not reveals the quality of walk or the maturity of a spiritual growth in man (1 Cor. 4:7-8): rather, (a) he is calling on individual to be wise and consecrated, and not to be led away with the error of the wicked, but be established in the present truth (2 Pet. 1:2) and to stand in the true grace of God wherein they stand (1 Pet. 5:12), lest they should fall from their own steadfastness. 2 Pet. 3:17: (b) God is calling on individual to make the difference in their calling and election  known through implicit obedience and submission to his word and to the operation of his hands in their lives to ‘work out your own salvation with fear and trembling’ before him (Philippians 2:12-13) who is at work in them both to will and do according to his good pleasure, and before the on-looking eyes of the  world and the angels of God to whom we are made as spectacle (2 Corinthians 4:9), and before our brethren in the Lord, if haply, we might draw or stir some of them up by our godly sincerity of life to challenge them to growing in the love of God (2 Cor. 9:2. Hebrews 10:24), not for competition, or by doing anything through strife or vain glory, but by showing our good conversation with meekness of wisdom (James 3:13), so as to meet up with Christ singular call and demand to ‘let your light so shine before men’ (Mt. 5:16): but you must need to separate, by walking away from every unscriptural spiritual attachments, practices, company, friendship and associations with the so called brethren who are having a form of godliness, but denying the power thereof ( 2 Timothy 3:1-5) and are not calling on the Lord out of a pure heart (flee also youthful lusts: but follow righteousness, faith, charity, peace, with them that call on the Lord out of a pure heart. 2 Timothy 2:22), for a child is known by his doings, whether his work be pure, and whether it be right. Proverbs 20:11.
The scriptures calls us to strive for the unity of the spirit in the bond of peace (Eph. 4:3), but it is wise to know the type or kind of people (for if he that cometh preaches another Jesus, whom we have not preached, or if ye receive another spirit, which ye have not received, or another gospel, which ye have not accepted, ye might well bear with him. 2 Corinthians 11:4) you should seek to strive together for the unity of the spirit lest you become a companion of fools who shall altogether be destroyed (Prov. 13:20): lest while you are seeking and trying to show the love and kindness of God to help those that are weak in faith (Rom.15:1), those who are ignorant and are out of the way, but they are with genuine spiritual infirmities, and are truly seeking for help (Heb. 5:2), you should not be defiled with the leaven (false doctrines and lifestyles of hypocritical love of God and love to neighbor) of the Pharisees of which the Lord warned his disciples to be very careful about. Luke 12:1-3.
There is a difference between a true brother in the Lord from a false brother in Christ – difference between the vessel unto honor – a believer of whom Christ says he is the salt of the earth, from the toxic believer who has lost his sweetness, a vessel unto dishonor, and a stumbling block of iniquity unto others, of whom the way of truth is evil spoken of – a difference between the true teacher or pastor who speaks and do as they that shall be judged by the law of liberty from the false pastor and teacher of lies who will teach others, but not himself – difference between the sheep and goat –  difference between the good from the evil men in the church. While none among us can presently remove the tares in separation from the wheat, it is the spiritual responsibility of the wheat (good and genuine children of the kingdom) to detach themselves from the company of the tares in separation unto God who has called them to make distinction as he teaches them -for his God doth instruct him to discretion, and doth teach him. Isaiah 28:26.
The question of unequally yoked together with unbelievers – unrepentant sinners in the world is already answered. God called and saved us out of the world (separation from sinners; 2 Corinthians 6:14-18) lest we should be partakers in the iniquity of Babylon (1 Cor. 5:9-13): but what about the question of ungodly yoked together with the sinners of God’s people (for, lo, I will command, and I will sift the house of Israel among all nations, like as corn is sifted in a sieve, yet shall not the least grain fall upon the earth. All the sinners of my people shall die by the sword, which say, the evil shall not overtake nor prevent us. Amos 9: 9-10) the sinners in Zion? Isaiah 33:14.
God expects us to answer this very particular question through individual’s thoughtful application of his word (a) by our circumspect walk as we gauge our spiritual measure on the scale of the written word in personal spiritual cross examination (2 Cor. 13:5): (b) and to scrutinize other’s walk and conducts in the balance and light of the same scriptures…but when I saw that they walked not uprightly according to the truth of the gospel, I said unto Peter before them all, if thou, being a Jew, lives after the manner of Gentiles, and not as do the Jews, why compels thou the Gentiles to live as do the Jews? Galatians 2:14.
But some will say that the bible says judge not, that you should not be judged! But the Lord would have us to understand that we should first judge our ways and conducts in the light of the scriptures which is self – spiritual cross examination (but he that is spiritual judges all things, yet he himself is judged of no man. For who hath known the mind of the Lord, that he may instruct him? But we have the mind of Christ. 1 Corinthians 2:15-16), and having brought every thought in us into captivity unto the obedient of Christ, we can justly go a – head in readiness to revenge all disobedient, once our obedience is complete as we cast down imaginations, and every high things that exalts itself against the knowledge of God (2 Corinthians 10:5-6): to judge the rightness or wrongness of the words (Job 12:11) ways and conducts of others in the light of the scriptures, in order to determine what part or area of their spiritual life should they be helped, if they are willing to receive help (reprove not a scorner, lest he hate thee: rebuke a wise man, and he will love thee. Give instruction to a wise man, and he will be yet wiser: teach a just man, and he will increase in learning Proverbs 9:8-9) either by prayer or scripture awareness to correct, instruct, teach or to rebuke, and to determine the best way or extent of our relationship with them in the Lord if they are not willing to change: and why beholds the mote that is in thy brother’s eye, but considers not the beam that is in your own eye? Or how wilt thou say to thy brother, let me pull out the mote out of your eye; and, behold, a beam is in your own eye? You hypocrite, first cast out the beam out of your own eye; and then shall thou see clearly to cast out the mote out of thy brother’s eye. Matthew 7:1-5.
In psalms 119 verses 63, King David expresses the sincerity, discretion and the distinction of his relationship with God when he says, I am a companion of all them that fear thee, and of them that keep thy precepts; while his son in the flesh, that is Christ, declares that he has no interest to have or to keep any friendship whatsoever with anyone, except with those who will do whatsoever he command them. John 15:14.
If we are walking and living according to the purpose of our calling as becomes saints, we shall definitely become an abomination to the sinners in the world and to the ungodly brethren in the church (an unjust man is an abomination to the just: and he that is upright in the way is abomination to the wicked. Proverbs 29:27): therefore, let their love, faithfulness to Christ and reverence for God determines the bond of our closeness and intimacy with them (confidence in an unfaithful man in time of trouble is like a broken tooth, and a foot out of joint. Prov. 25:19), lest any of the faithful brethren in the Lord should ever think in his heart that he can have a trusted and good friendship with the unbelievers or from the ungodly men in the church by good impression and positive resolve: let favor be shown to the wicked, yet will he not learn righteousness, in the land of the uprightness he will he deal unjustly, and will not behold the majesty of God. Isaiah 26:10.
Note: spiritual discretion is to serve as your red flag signal in your relationship with man – to guide your affairs well (Psalms 112:5), and to impart you with divine wisdom to navigate through different seasons with God (and David behaved himself wisely in all his ways; and the Lord was with him. Wherefore when Saul saw that he behaved himself very wisely, he was afraid of him. But all Israel and Judah loved David, because he went out and came in before them. 1 Samuel 18:14-16), while at the same time, you’re enjoying his present rest: while spiritual distinction reveals the quality (upright, just, meek, holy, humble, godly, consecration, prayerfulness, watchfulness, diligent to maintain every good works, steadfastness and obedience in all things, 2 Cor. 2:9) of your spiritual life and walk with God – the righteous also shall hold on his way, and he that hath clean hands shall be stronger and stronger. Job1:8. Job.17:9. Job 27:6.
Jesus loves sinners and he died for them – a friend of sinners and publicans (Mat. 11:19): for such an priest became us, who is holy, harmless, separate from sinners, and made higher than the heaven: but it is also written that he separated from sinners Heb. 7:26.
Christ loves sinners, yet he separated himself from them: this is the power of discretion which shall also preserve you, and understanding which shall keep your soul and life from unforced spiritual errors, and from wicked people, and from troubles: when wisdom enters into your heart, and knowledge is pleasant unto thy soul; discretion shall preserve thee, understanding shall keep thee: to deliver thee from the way of the evil man, from the man that speaks froward things; who leave the paths of uprightness, to walk in the ways of darkness; who rejoice to do evil, and delight in the forwardness of the wicked; whose ways are crooked, and they froward in their paths: to deliver thee from the strange woman, even from the stranger which flatters with her words; which forsakes the guide of her youth, and forgets the covenant of her God. For her house incline unto death, and her paths unto the dead. None that go unto her return again, neither take they hold of the paths of life. That thou may walk in the way of good men, and keep the paths of the righteous.  For the upright shall dwell in the land, and the perfect shall remain in it. But the wicked shall be cut off from the earth, and the transgressors shall be rooted out of it. Prov. 2:10-22.
Every word of God is pure he is a shield unto them that trust in him (Prov. 30:5) to keep you from the path of the destroyer that you might walk uprightly and securely in the way (concerning the works of men, by the word of thy lips I have kept me from the paths of the destroyer. Hold up my goings in thy paths, that my footsteps slip not. Psalms 17:4-5. Prov. 10:9): to keep you from the men of inconsistent character, lest you be destroyed alongside (Prov. 24:20-21): to keep you from the company of an angry, wrathful and jealous man (Prov. 19:11. Prov. 22:24); wrath is cruel, and anger is outrageous; but who is able to stand before jealousy? Prov. 27:4: to keep you from the bitter and cursing words coming out of the unlearned tongue – his slanderous and piercing words like the piercing of a sword,  his vain talks and jestings which are not convenient with coarse joking (go from the presence of a foolish man, when thou perceives not in him the lips of knowledge. Prov. 14:7): to keep you in peace from the abusive relationship of a brawling wife (Prov. 21:9 & 19: Prov. 27:15-16), though you seek to hide her as any foolish man would attempt to hide the wind, but her beauty without discretion will expose her (as a jewel of gold in a swine’s snout, so is a fair woman which is without discretion. Prov. 11:22): to keep you away from the company of the proud men and women who are cursed by God (Psalms 119:21): better poor and humble, than proud and rich, lest you become curse as well – mind not high things, but condescend with men of low estate (Prov. 16:19. Rom. 12:16): to keep you from the sin of acceptance and approval of evil by association with evil man (but God says to evil men: recite my laws no longer and stop claiming my promises, for you have refused my discipline, disregarding my laws. You see a thief and help him, and spend your time with evil and immoral men. Psalms 50:16-18)
The emotional attitudes of Jonathan, though partially good in men’s eyes, is not the way God operates and it’s not way he expects us to operate. But Jonathan, Saul’s son, should not have died prematurely in battle alongside King Saul his father, had he walk his talk with David into the wood, to do what is consistence with his claim (and Jonathan Saul’s son arose, and went to David into the wood, and strengthened his hand in God. And he said unto him, Fear not: for the hand of Saul my father shall not find thee; and thou shall be king over Israel, and I shall be next unto thee; and that also Saul my father knows. And they two made a covenant before the Lord: and David abode in the wood, and Jonathan went to his house. 1 Sam.23:18), instead of not going back to the city, and into the palace, but he chose to leave David behind in the wood. Had he practically shown the difference through separation between him and his evil father, he should not be guilty of the sin of ungodly yoked, but should have lived to become the second in command to David in power after the death of King Saul. His loyalty and love for David was great, surpasses the love of a woman, but his failure to distance himself openly and bodily away from the city and far from the palace into the wood to retire unto David as some did (1 Sam. 22:2) caused him to share together in the wrathful – fatal judgment of God against Saul at battle with the Philistines – Saul and Jonathan were lovely and pleasant in their lives, and in their death they were not divided. 2 Sam. 1:23.
If you are presently walking through the narrow way and the straight gate to heaven, let discretion keep you in the way as you keep making the difference by your lifestyles in the beauty of a great price in contrast to those who are travelling down to hell through the broad way and wide gate by their ungodly and worldly lifestyles in their strange clothing in the world and in the house of God, though they claim to be called by his name. Zephaniah 1:18.  
It is those who will make the difference to run the race in such a way as to get the prize that will make it to heaven – don’t you realize that in a race everyone runs, but only one person gets the prize? So run to win. 1 Corinthians 9:24.  It is impossible to be walking on the higher ground while at the same time be found to be walking through the crooked paths with them of careless attitudes of thoughtless heavenly pilgrimage. It is impossible to be walking in the way of the wise – the way of life, while at the same time should be found fooling around with the foolish in the way of death: but the wise virgin by discretion, teaches us that the request of the foolish brethren in their company should not be granted for whatever reason (Mt 25:9), lest they should all missed the sudden arrival of the bridegroom for the instant admission into the banquet hall by any thoughtless good work or action to share oil to keep the lamp burning – if you are wise, you will be wise for yourself. Prov. 9:12.
The scripture helps you to draw the line, and to put a limit on what you will do or allow to happen in your relationships with others either within the church with your brethren in Christ, or without, that is, with the unbelievers at work, home or neighborhood, if the word of God is against it (Heb. 2:1-2): failure to heed the written word is loss of sense of direction – disorientation of your spiritual life, for two people cannot walk together, except they be agreed. Amos 3:3.