{10} Let no man deceive himself. If any man among you seemeth to be wise in this world, let him become a fool, that he may be wise.

(10) He concludes by the opposite, that they profess pure wisdom in the Church of God, who refuse and cast away all those vanities of men. Further, if they are mocked by the world, it is sufficient for them that they are wise according to the wisdom of God, and as he will have them to be wise.

People's New Testament

3:18 Let no man deceive himself. A caution against the philosophical tendencies of the Apolloite party.

If any man among you seemeth to be wise in this world. If he is wise in his own estimation and that of the world calls foolishness (1Co 1:18,23 2:14) in order that he may became wise unto salvation (2Ti 3:15).

Wesley's Notes

3:18 Let him become a fool in this world - Such as the world accounts so. That he may become wise - In God's account.

Jamieson-Fausset-Brown Bible Commentary

18. seemeth-that is, is, and is regarded by himself and others.

wise in this world-wise in mere worldly wisdom (1Co 1:20).

let him become a fool-by receiving the Gospel in its unworldly simplicity, and so becoming a fool in the world's sight [Alford]. Let him no longer think himself wise, but seek the true wisdom from God, bringing his understanding into captivity to the obedience of faith [Estius].

Matthew Henry's Concise Commentary

3:18-23 To have a high opinion of our own wisdom, is but to flatter ourselves; and self-flattery is the next step to self-deceit. The wisdom that wordly men esteem, is foolishness with God. How justly does he despise, and how easily can he baffle and confound it! The thoughts of the wisest men in the world, have vanity, weakness, and folly in them. All this should teach us to be humble, and make us willing to be taught of God, so as not to be led away, by pretences to human wisdom and skill, from the simple truths revealed by Christ. Mankind are very apt to oppose the design of the mercies of God. Observe the spiritual riches of a true believer; All are yours, even ministers and ordinances. Nay, the world itself is yours. Saints have as much of it as Infinite Wisdom sees fit for them, and they have it with the Divine blessing. Life is yours, that you may have a season and opportunity to prepare for the life of heaven; and death is yours, that you may go to the possession of it. It is the kind messenger to take you from sin and sorrow, and to guide you to your Father's house. Things present are yours, for your support on the road; things to come are yours, to delight you for ever at your journey's end. If we belong to Christ, and are true to him, all good belongs to us, and is sure to us. Believers are the subjects of his kingdom. He is Lord over us, we must own his dominion, and cheerfully submit to his command. God in Christ, reconciling a sinful world to himself, and pouring the riches of his grace on a reconciled world, is the sum and substance of the gospel.

Matthew Henry's Whole Bible Commentary

Verses 18-20

Here he prescribes humility, and a modest opinion of themselves, for the remedy of the irregularities in the church of Corinth, the divisions and contests among them: "Let no man deceive himself, v. 18. Do not be led away from the truth and simplicity of the gospel by pretenders to science and eloquence, by a show of deep learning, or a flourish of words, by rabbis, orators, or philosophers." Note, We are in great danger of deceiving ourselves when we have too high an opinion of human wisdom and arts; plain and pure Christianity will be likely to be despised by those who can suit their doctrines to the corrupt taste of their hearers, and set them off with fine language, or support them with a show of deep and strong reasoning. But he who seems to be wise must become a fool that he may be wise. He must be sensible of his own ignorance, and lament it; he must distrust his own understanding, and not lean on it. To have a high opinion of our wisdom is but to flatter ourselves, and self-flattery is the very next step to self-deceit. The way to true wisdom is to sink our opinion of our own to a due level, and be willing to be taught of God. He must become a fool who would be truly and thoroughly wise. The person who resigns his own understanding, that he may follow the instruction of God, is in the way to true and everlasting wisdom. The meek will he guide in judgment, the meek will he teach his way, Ps. 25:9. He that has a low opinion of his own knowledge and powers will submit to better information; such a person may be informed and improved by revelation: but the proud man, conceited of his own wisdom and understanding, will undertake to correct even divine wisdom itself, and prefer his own shallow reasonings to the revelations of infallible truth and wisdom. Note, We must abase ourselves before God if we would be either truly wise or good: For the wisdom of this world is foolishness with God, v. 19. The wisdom which worldly men esteem (policy, philosophy, oratory) is foolishness with God. It is so in a way of comparison with his wisdom. He chargeth his angels with folly (Job 4:18), and much more the wisest among the children of men. His understanding is infinite, Ps. 147:5. There can be no more comparison between his wisdom and ours than between his power and being and ours. There is no common measure by which to compare finite and infinite. And much more is the wisdom of man foolishness with God when set in competition with his. How justly does he despise, how easily can he baffle and confound it! He taketh the wise in their own craftiness (Job 5:13), he catches them in their own nets, and entangles them in their own snares: he turns their most studies, plausible, and promising schemes against themselves, and ruins them by their own contrivance. Nay, He knows the thoughts of the wise, that they are vain (v. 20), that they are vanity, Ps. 94:11. Note, God has a perfect knowledge of the thoughts of men, the deepest thoughts of the wisest men, their most secret counsels and purposes: nothing is hidden from him, but all things are naked and bare before him, Heb. 4:13. And he knows them to be vanity. The thoughts of the wisest men in the world have a great mixture of vanity, of weakness and folly, in them; and before God their wisest and best thoughts are very vanity, compared, I mean, with his thoughts of things. And should not all this teach us modesty, diffidence in ourselves, and a deference to the wisdom of God, make us thankful for his revelations, and willing to be taught of God, and not be led away by specious pretences to human wisdom and skill, from the simplicity of Christ, or a regard to his heavenly doctrine? Note, He who would be wise indeed must learn of God, and not set his own wisdom up in competition with God's.