Chapter 16 — Part II: The Sacraments — Baptism
Section 113. Why The Practice Of Virtue Is Difficult Even After Baptism — Though we are thus supported by a powerful array of virtues, it should not excite our surprise if we cannot, without much labor and difficulty, undertake, or at least, perform acts of piety and of moral virtue. If this is so, it is not because the goodness of God has not bestowed on us the virtues from which these good works proceed; but because there still remains after Baptism a severe conflict of the flesh against the spirit, in which, however, it would not become a Christian to be dispirited or grow faint.