2 Wherefore let us persevere, retaining with all diligence what we have heard; that when the fast is over, the fruit of the fast may abound, and that by the good things we gathered from the fast, we may remember the fast itself. If thus we fashion ourselves, we shall, when the fast returns, welcome it again with pleasure. For I see many who are so feeble-minded, that at the present season they are anxious about the following Lent; and I have heard many saying, that after their liberation from the fast, they are insensible to any pleasure from this remission, on account of their anxiety about the coming year. What can be more feeble-minded than this? I ask; and what is the cause of this? It is, that when the fast is arrived, we do not take pains that the concerns of the soul may be well ordered, but we limit the fast solely to an abstinence from food. Since, were we to reap the full benefit of it in a reformation of conduct, we should wish the fast to come round every day, receiving in very deed an experience of its good effects; and we should never cast away the desire of it, or be dejected and anxious while expecting it.
Source: Homilies on the Statues (New Advent)