Psalms 8:2

The meaning is this: you are worthy of praise not only from those who are perfect who know you fully, but you are proclaimed with the mouths of beginners in the faith and little children.… The psalmist professes that even infants proclaim God. By this he means those who have begun to come to the Lord in newness of faith, so that this wisdom might appear to have been conferred through God's intervention rather than to have been gleaned through human effort.

David composed the eighth psalm with reference to Christ, speaking of his divine nature in the first verses of it, as the Lord Christ himself also testifies of it in the Gospel, when they strewed his way with branches and praised him with shouts of welcome, saying: Hosanna to the son of David! Blessed is he that cometh in the name of the Lord! And when the Jews, finding themselves powerless to rebuke the multitudes and the children, (for it was a marvellous spectacle—to see boys, babes and sucklings, and the disciples and the multitudes joining in shouts of applause, and with loud voices praising him in song), took in hand to throw questions at him, and said to him: Hearest thou not what these are saying? But another evangelist says: Some from among the crowd said to him: Rebuke thy disciples; as if they would say—Why dost thou blaspheme, accepting a hymn which can be suitably applied to God alone? each of the parties who addressed him having the same purpose in view. Unto them the Lord said—to the one party: Yea, have ye never read; Out of the mouth of babes and sucklings thou hast ordained praise? clearly indicating that the eighth psalm had reference to him.

"Out of the mouth of babes and sucklings Thou hast made perfect praise, because of Thine enemies" [Psalm 8:2]. I cannot take babes and sucklings to be any other than those to whom the Apostle says, "As unto babes in Christ I have given you milk to drink, not meat." [1 Corinthians 3:1-2] Who were meant by those who went before the Lord praising Him, of whom the Lord Himself used this testimony, when He answered the Jews who bade Him rebuke them, "Have ye not read, out of the mouth of babes and sucklings Thou hast made perfect praise?" [Matthew 21:16] Now with good reason He says not, Thou hast made, but, "Thou hast made perfect praise." For there are in the Churches also those who now no more drink milk, but eat meat: whom the same Apostle points out, saying, "We speak wisdom among them that are perfect;" [1 Corinthians 2:6] but not by those only are the Churches perfected; for if there were only these, little consideration would be had of the human race. But consideration is had, when they too, who are not as yet capable of the knowledge of things spiritual and eternal, are nourished by the faith of the temporal history, which for our salvation after the Patriarchs and Prophets was administered by the most excellent Power and Wisdom of God, even in the Sacrament of the assumed Manhood, in which there is salvation for every one that believeth; to the end that moved by Its authority each one may obey Its precepts, whereby being purified and "rooted and grounded in love," he may be able to run with Saints, no more now a child in milk, but a young man in meat, "to comprehend the breadth, the length, the height, and depth, to know also the surpassing knowledge of the love of Christ." [Ephesians 3:17-19]