The Lord God has hidden His wisdom from those who are wise according to the flesh; on the other hand, He has revealed it to infants. Here Christ calls “infants” those who lend faith to God’s Word in childlike simplicity, who become obedient students of the heavenly wisdom, and who are glad to be fools in this world, as St. Paul says in 1 Corinthians 3:18, that they may be wise to God. The Lord God has revealed the knowledge of Him to those who are unwise and infants in the eyes of the world. He has revealed it not only outwardly, in the Word, as it is presented to all men, but also inwardly, in the spirit and in the heart. “Yes, Father,” says Christ further, “for so it was pleasing in Your sight.” It is altogether just, what happens to these wise and clever; if they are unwilling to lay aside their carnal wisdom, then they will also not come to the knowledge of the heavenly wisdom. This is God’s righteous judgment and His well-pleasing counsel. “Since the world, through its wisdom, did not know God in His wisdom, it pleased God, through foolish preaching, to save those who believe in it (1 Cor. 1:21), not as if He took pleasure in it when men perish, for He sees to it that they are all called through the Word. But if they are unwilling to follow, placing their carnal wisdom and desires ahead of His Word, then it certainly happens to them that the mysteries of divine wisdom remain hidden from them.
But in order that we might know that we should seek divine wisdom only in the Word revealed to us by the Son, Christ adds: “All things have been delivered to Me by My Father,” that is, just as the heavenly Father has delivered all things to Me as the Son of Man, having placed all authority in heaven and on earth and all creation under My feet (Psa. 8:7; Mat. 28:18; Eph. 1:22), so also to Me, as the appointed, sole Mediator, He has delivered this, that through the Word and the Spirit, I can and should give the true knowledge of God to men, enlighten their hearts, and be their only Master and Teacher. In this matter, nothing is accomplished with worldly wisdom. “No one knows the Son except for the Father, and no one knows the Father except for the Son.” That is, no man may come to the true knowledge of God by his natural powers, but it must be revealed by the Son, who is in the bosom of the Father (John 1:3). He alone knows the Father; therefore, He alone can also bring a person to the true, saving knowledge of God. By no means, however, is the Holy Spirit excluded thereby, for He is the One who is of one essence with the Father and the Son and who “searches the deep things of the divinity” (1 Cor. 2:10).
(Sermon for St Matthias-February 24, Postilla Volume 3 by Johann Gerhard, Repristination Press, page 50-51)