24 Again, we must not repose so blind a confidence in human intellect as to imagine that we have complete knowledge of the objects of our thought, or that the ultimate problem is solved as soon as we have formed a symmetrical and consistent theory. Finite minds cannot conceive the Infinite; a being dependent for its existence upon another cannot attain to perfect knowledge either of its Creator or of itself, for its consciousness of self is coloured by its circumstances, and bounds are set which its perception cannot pass.
Its activity is not self-caused, but due to the Creator, and a being dependent on a Creator has perfect possession of none of its faculties, since its origin lies outside itself. Hence by an inexorable law it is folly for that being to say that it has perfect knowledge of any matter; its powers have limits which it cannot modify, and only while it is under the delusion that its petty bounds are coterminous with infinity can it make the empty boast of possessing wisdom. For of wisdom it is incapable, its knowledge being limited to the range of its perception, and sharing the impotence of its dependent existence.
And therefore this masquerade of a finite nature boasting that it possesses the wisdom which springs only from infinite knowledge earns the scorn and ridicule of the Apostle, who calls its wisdom folly. He says, For Christ sent me not to baptize, but to preach the Gospel, not in the language of wisdom, lest the cross of Christ should be made void. For the word of the cross is foolishness to them that are perishing, but unto them that are being saved it is the power of God.
For it is written, I will destroy the wisdom of the wise and the understanding of the prudent I will reject. Where is the wise? Where is the scribe? Where is the enquirer of this world? Hath not God made foolish the wisdom of this world? For seeing that in the wisdom of God the world through its wisdom knew not God, God decreed through the foolishness of preaching to save them that believe. For the Jews ask for signs and the Greeks seek after wisdom, but we preach Christ crucified, unto Jews indeed a stumbling-block and to Gentiles foolishness, but unto them that are called, both Jews and Greeks, Christ the power of God and the wisdom of God.
Because the weakness of God is stronger than men, and the foolishness of God is wiser than men</em>. Thus all unbelief is foolishness, for it takes such wisdom as its own finite perception can attain, and, measuring infinity by that petty scale, concludes that what it cannot understand must be impossible. Unbelief is the result of incapacity engaged in argument. Men are sure that an event never happened, because they have made up their minds that it could not happen.
Source: On the Trinity (New Advent)