Out of the mouth of babes and infants have you ordained strength because of your enemies, that you might still the enemy and the avenger.
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Augustine of Hippo
5. "Out of the mouth of babes and sucklings Thou hast made perfect praise, because of Thine enemies" (ver. 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." 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?" 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;" 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 t...
Praise. But why does the prophet take notice of this proof of Christ's being the Messias, while he passes over his curing the sick? St. Chrysostom answers, because the other miracles had been performed in the old law, but God had never before opened the mouths of infants to proclaim "praise the Lord "as they did when they bore witness to Christ entering the temple. Other commentators greatly weaken this proof. (Berthier)
We read that after the passage of the Red Sea, wisdom opened the mouth of the dumb, and made the tongues of infants eloquent; (Wisdom x. 21.) which may be a figurative expression. The prophets and apostles, whom the world looked upon as fools, were chosen to declare the highest mysteries. All nature so clearly proves the existence of Providence, that, if other things were silent, infants would open their mouths to confound the incredulous. The condition of man from his infancy is, in effect, one of the plainest proofs of the divine wisdom. His imitative powers, the ea...