13 We have completed the second week of the fast, but this we should not consider; for going through the fast does not consist in merely going through the time, but in going through it with amendment of manners. Let us consider this; whether we have become more diligent; whether we have corrected any of our defects; whether we have washed away our sins? It is common for every one to ask in Lent, how many weeks each has fasted; and some may be heard saying that they have fasted two, others three, and others that they have fasted the whole of the weeks.
But what advantage is it, if we have gone through the fast devoid of good works? If another says, “I have fasted the whole of Lent,” do thou say, “I had an enemy, but I was reconciled; I had a custom of evil-speaking, but I put a stop to it; I had a custom of swearing, but I have broken through this evil practice.” It is of no advantage to merchants, to have gone over a great extent of ocean, but to have sailed with a freight and much merchandise. The fast will profit us nothing, if we pass through it as a mere matter of course, without any result.
If we practise a mere abstinence from meats, when the forty days are past, the fast is over too. But if we abstain from sins, this still remains, even when the fast has gone by, and will be from this time a continual advantage to us; and will here render us no small recompense, before we attain unto the kingdom of heaven. For as he who is living in iniquity, even before hell, has punishment, being stung by his conscience; so the man who is rich in good works, even before the kingdom, will have the benefit of exceeding joy, in that he is nourished with blessed hopes.
Source: Homilies on the Statues (New Advent)