Because that which the world deems foolish in God is wiser than men's wisdom, and that which it deems feeble in God is mightier than men's might.

Because what seems foolish in God is wiser than men; and what seems feeble in God is stronger than men.

For what is foolishness to God is considered wise by men, and that which is weakness to God is considered strong by men.

For God's 'folly' is wiser than people, and God's 'weakness' is stronger than people.

For the foolishness of God While the Lord deals with us in such a way as to seem to act foolishly, because he does not exhibit his wisdom, what appears foolishness surpasses in wisdom all the ingenuity of men. Farther, while God appears to act with weakness, in consequence of his concealing his power, that weakness, as it is reckoned, is stronger than any power of men. We must, however, always keep it in view, that there is a concession, as I have noticed a little ago. For no one can but perceive, that in strict propriety neither foolishness nor weakness can be ascribed to God, but it was necessary, by such ironical expressions, to beat down the mad presumption of the flesh, which does not scruple to rob God of all his glory.

Because the foolishness of God - That which God appoints, requires, commands, does, etc., which appears to people to be foolish. The passage is not to be understood as affirming that it is really foolish or unwise; but that it appears so to people - Perhaps the apostle here refers to those parts of the divine administration where the wisdom of the plan is not seen; or where the reason of what God does is concealed.
Is wiser than men - Is better adapted to accomplish important ends, and more certainly effectual than the schemes of human wisdom. This is especially true of the plan of salvation - a plan apparently foolish to the mass of people - yet indubitably accomplishing more for the renewing of people, and for their purity and happiness, than all the schemes of human contrivance. They have accomplished nothing toward people's salvation; this accomplishes everything. They have always failed; this never fails.
The weakness of God - There is really no weakness in God, any more than there is folly. This must mean, therefore, the things of his appointment which appear weak and insufficient to accomplish the end. Such are these facts - that God should seek to save the world by Jesus of Nazareth, Who was supposed unable to save himself Matthew 27:40-43; and that he should expect to save people by the gospel, by its being preached by people who were without learning, eloquence, wealth, fame, or power. The instruments were feeble; and people judged that this was owing to the weakness or lack of power in the God who appointed them.
Is stronger than men - Is able to accomplish more than the utmost might of man. The feeblest agency that God puts forth - so feeble as to be esteemed weakness - is able to effect more than the utmost might of man. The apostle here refers particularly to the work of redemption; but it is true everywhere. We may remark:
(1) That God often effects his mightiest plans by that which seems to men to be weak and even foolish. The most mighty revolutions arise often from the slightest causes; his most vast operations are often connected with very feeble means. The revolution of empires; the mighty effects of the pestilence; the advancement in the sciences, and arts, and the operations of nature, are often brought about by means apparently as little suited to accomplish the work as those which are employed in the plan of redemption.
(2) God is great. If his feeblest powers put forth, surpass the mightiest powers of man, how great must be his might. If the powers of man who rears works of art; who levels mountains and elevates vales; if the power which reared the pyramids, be as nothing when compared with the feeblest putting forth of divine power, how mighty must be his arm! How vast that strength which made, and which upholds the rolling worlds! How safe are his people in his hand! And how easy for him to crush all his foes in death!

The foolishness of God is wiser, etc. - The meaning of these strong expressions is, that the things of God's appointment, which seem to men foolishness, are infinitely beyond the highest degree of human wisdom; and those works of God, which appear to superficial observers weak and contemptible, surpass all the efforts of human power. The means which God has appointed for the salvation of men are so wisely imagined and so energetically powerful, that all who properly use them shall be infallibly brought to the end - final blessedness, which he has promised to them who believe and obey.

Because the foolishness of God,.... Not that there is any such thing as "foolishness" in God, nor the least degree of weakness in him; but the apostle means that which the men of the world esteem so, and therefore, by an ironical concession, calls it by those names; by which is intended either Christ, who, as crucified, is counted foolishness; yet he "is wiser than men": yea, even than Solomon, who was wiser than all men besides; Christ is greater than he in wisdom, having all the treasures of wisdom and knowledge in him; yea, in redemption by the blood of his cross, which is accounted such an egregious instance of folly, there is such a display of wisdom as surpasses all the wisdom of men and angels: and though he is, as crucified, esteemed as
the weakness of God, yet in this respect,
is stronger than men; stronger than the strong man armed; and has done that by his own arm, has brought salvation for his people, which neither men nor angels could ever have done: or all this may be understood of the Gospel of Christ, which is condemned as folly and weakness, and yet has infinitely more wisdom in it, than is to be found in the best concerted schemes of the wisest philosophers; and has had a greater influence on the minds and manners of men than theirs ever had; it is the manifold wisdom of God, and the power of God unto salvation. Moreover, these words may be applied to the saints, called in 1-Corinthians 1:27.
the foolish and weak things of the world; and yet even these, in the business of salvation, how foolish soever they may be in other respects, are wiser than the wisest of men destitute of the grace of God; and however weak they are in themselves, in their own esteem, and in the account of others, they are able to do and suffer such things, through the strength of Christ that no other men in the world are able to perform or endure. The phrases here used seem to be a sort of proverbial ones; and the sense of them is, that whatever, in things divine and spiritual, has the appearance of folly and weakness, or is judged to be so by carnal men, is wiser and stronger not only than the wisdom and strength of men, but than men themselves with all their wisdom and strength. It is very likely, that proverbial expressions of this kind, with a little alteration, were used by the Jews. The advice the young men gave to Rehoboam is thus paraphrased by the Targumist (o), , "my weakness is stronger than the strength of my father"; which is very near the same with the last clause of this verse,
(o) In 2 Chron. x. 10.

foolishness of God--that is, God's plan of salvation which men deem "foolishness."
weakness of God--Christ "crucified through weakness" (2-Corinthians 13:4, the great stumbling-block of the Jews), yet "living by the power of God." So He perfects strength out of the weakness of His servants (1-Corinthians 2:3; 2-Corinthians 12:9).

Because the foolishness of God - The gospel scheme, which the world judge to be mere foolishness, is wiser than the wisdom of men; and, weak as they account it, stronger than all the strength of men.