Anti-pelagian Writings by St. Augustine
Chapter 7 [IV.]--Proof of Original Sin in Infants.
Now, although I may not be able myself to refute the arguments of these men, I yet see how necessary it is to adhere closely to the clearest statements of the Scriptures, in order that the obscure passages may be explained by help of these, or, if the mind be as yet unequal to either perceiving them when explained, or investigating them whilst abstruse, let them be believed without misgiving. But what can be plainer than the many weighty testimonies of the divine declarations, which afford to us the clearest proof possible that without union with Christ there is no man who can attain to eternal life and salvation; and that no man can unjustly be damned, -- that is, separated from that life and salvation, -- by the judgment of God? The inevitable conclusion from these truths is this, that, as nothing else is effected when infants are baptized except that they are incorporated into the church, in other words, that they are united with the body and members of Christ, unless this benefit has been bestowed upon them, they are manifestly in danger of damnation. Damned, however, they could not be if they really had no sin. Now, since their tender age could not possibly have contracted sin in its own life, it remains for us, even if we are as yet unable to understand, at least to believe that infants inherit original sin.