11 If I wish you then not to live with your mother, it is for the reasons given above, and above all for the two following. If she offers you delicacies to eat, you will grieve her by refusing them; and if you take them, you will add fuel to the flame that already burns within you. Again in a house where there are so many girls you will see in the daytime sights that will tempt you at night. Never take your hand or your eyes off your book; learn the psalms word for word, pray without ceasing, be always on the alert, and let no vain thoughts lay hold upon you. Direct both body and mind to the Lord, overcome wrath by patience, love the knowledge of scripture, and you will no longer love the sins of the flesh. Do not let your mind become a prey to excitement, for if this effects a lodgment in your breast it will have dominion over you and will lead you into the great transgression. Always have some work on hand, that the devil may find you busy. If apostles who had the right to live of the Gospel laboured with their own hands that they might be chargeable to no man, and bestowed relief upon others whose carnal things they had a claim to reap as having sown unto them spiritual things; why do you not provide a supply to meet your needs? Make creels of reeds or weave baskets out of pliant osiers. Hoe your ground; mark out your garden into even plots; and when you have sown your cabbages or set your plants convey water to them in conduits; that you may see with your own eyes the lovely vision of the poet:
Art draws fresh water from the hilltop near
Till the stream plashing down among the rocks
Cools the parched meadows and allays their thirst.
Graft unfruitful stocks with buds and slips that you may shortly be rewarded for your toil by plucking sweet apples from them. Construct also hives for bees, for to these the proverbs of Solomon send you, and you may learn from the tiny creatures how to order a monastery and to discipline a kingdom. Twist lines too for catching fish, and copy books; that your hand may earn your food and your mind may be satisfied with reading. For “every one that is idle is a prey to vain desires.” In Egypt the monasteries make it a rule to receive none who are not willing to work; for they regard labour as necessary not only for the support of the body but also for the salvation of the soul. Do not let your mind stray into harmful thoughts, or, like Jerusalem in her whoredoms, open its feet to every chance comer.
Source: Letters (New Advent)