10 Let her learn too how to spin wool, to hold the distaff, to put the basket in her lap, to turn the spinning wheel and to shape the yarn with her thumb. Let her put away with disdain silken fabrics, Chinese fleeces, and gold brocades: the clothing which she makes for herself should keep out the cold and not expose the body which it professes to cover. Let her food be herbs and wheaten bread with now and then one or two small fishes. And that I may not waste more time in giving precepts for the regulation of appetite (a subject I have treated more at length elsewhere) let her meals always leave her hungry and able on the moment to begin reading or chanting.
I strongly disapprove— especially for those of tender years— of long and immoderate fasts in which week is added to week and even oil and apples are forbidden as food. I have learned by experience that the ass toiling along the high way makes for an inn when it is weary. Our abstinence may turn to glutting, like that of the worshippers of Isis and of Cybele who gobble up pheasants and turtle-doves piping hot that their teeth may not violate the gifts of Ceres. If perpetual fasting is allowed, it must be so regulated that those who have a long journey before them may hold out all through; and we must take care that we do not, after starting well, fall halfway.
However in Lent, as I have written before now, those who practise self-denial should spread every stitch of canvas, and the charioteer should for once slacken the reins and increase the speed of his horses. Yet there will be one rule for those who live in the world and another for virgins and monks. The layman in Lent consumes the coats of his stomach, and living like a snail on his own juices makes ready a paunch for rich foods and feasting to come. But with the virgin and the monk the case is different; for, when these give the rein to their steeds, they have to remember that for them the race knows of no intermission.
An effort made only for a limited time may well be severe, but one that has no such limit must be more moderate. For whereas in the first case we can recover our breath when the race is over, in the last we have to go on continually and without stopping.
Source: Letters (New Advent)