It is this one Spirit who makes it possible for an infant to be regenerated . . . when that infant is brought to baptism; and it is through this one Spirit that the infant so presented is reborn. For it is not written, 'Unless a man be born again by the will of his parents' or 'by the faith of those presenting him or ministering to him,' but, 'Unless a man be born again of water and the Holy Spirit.' The water, therefore, manifesting exteriorly the sacrament of grace, and the Spirit effecting interiorly the benefit of grace, both regenerate in one Christ that man who was generated in Adam.
Saint AugustineEveryone who observes himself doubting observes a truth, and about that which he observes he is certain; therefore he is certain about a truth. Everyone therefore who doubts whether truth exists has in himself a truth on which not to doubt.... Hence one who can doubt at all ought not to doubt the existence of truth.
Saint AugustineThe flesh does not by its own virtue purify, but is purified by virtue of the Word by which it was assumed, when 'the Word became flesh and dwelt among us' (Jn. 1:14).
Saint AugustineThe measure of charity may be taken from the want of desires. As desires diminish in the soul, charity increases in it; and when it no longer feels any desire, then it possesses perfect charity.
Saint Augustine