God chose what is low and despised in the world, even things that are not, to bring to nothing things that are,
καὶ τὰ ἀγενῆ τοῦ κόσμου καὶ τὰ ἐξουθενημένα ἐξελέξατο ὁ θεός, τὰ μὴ ὄντα, ἵνα τὰ ὄντα καταργήσῃ,
And the base things of the world, and the things that are despised, and the things that are not, that he might bring to naught the things that are. Now what does He call things that are not? Those persons who are considered to be nothing because of their great insignificance. Thus has He shown forth His great power, casting down the great by those who seem to be nothing. The same elsewhere he thus expresses, 2 Corinthians 12:9 For my strength is made perfect in weakness. For a great power it is, to teach outcasts and such as never applied themselves to any branch of learning, how all at once to discourse wisely on the things which are above the heavens. For suppose a physician, an orator, or any one else: we then most admire him, when he convinces and instructs those completely uneducated. Now, if to instil into an uneducated man the rules of art be a very wonderful thing, much more things which pertain to so high philosophy.
3. But not for the wonders sake only, neither to show His own power, has He done this, but to check also the arrogant. And therefore he both said before, That he might confound the wise and the strong, that He might bring to nought the things which are, and here again,
Haydock Catholic Bible Commentary: 1 Corinthians
Vocation, is here used for the called, as Rom. iii. 30. circumcision for the circumcised, (ibid. xi. 7.) election for the elected. V. — Consider your manner of being called; not many, hitherto, of those who have believed, or of those who have preached the gospel, are wise according to the flesh, or as to worldly wisdom; and in the esteem of men, not many mighty, not many noble. God hath chosen such as are looked upon as illiterate, without power, without riches, without human wisdom, to confound the great and wise men: He hath chosen the things that are not, that is, says S. Chrys. men reputed as nothing, of no consideration, to confound, to destroy, to make subject to him, and to the gospel, men who had the greatest worldly advantages, that no flesh, no men how great, wise, rich, or powerful soever, might glory in his sight, or attribute their call, and their salvation to their own merits. — From him you are in Christ Jesus brought to believe in him, who is made to us wisdom, acknowledged to be the wisdom of his eternal Father, by whom we have been justified, sanctified, redeemed. We have nothing of ourselves to boast of, and can only glory in the Lord. Wi. — And the mean things. In the beginning of Christianity, it was frequently objected to the Christians, that they had none but men of the basest extraction. The emperor Julian likewise made the Catholics the same reproach. Grot. — But this objection was not founded; for we find many persons of consideration mentioned in the Scriptures, who had embraced Christianity. Witness, v. 1. of this chap. Sosthenes, the head of the synagogue at Corinth, and some in the very palace of Cæsar.