21 No one in creation is rich but he that fears God; no one is truly poor but he that lacks the truth. How needy is he, and not rich, whose need witnesses against him that even from the abject and the beggars he needs to receive a gift. He is truly a bondman, and many are his masters: he renders service to money, to riches, and possessions. His lords are void of mercy, for they grant him no repose. Flee, and live in poverty; (as) a mother she pities her beloved. Seek refuge in indigence, who nourishes her children with choice things; her yoke is light and pleasant, and sweet to the palate her memory. The sick in conscience alone abhors the draught of poverty; the fainthearted dreads the yoke of indigence that is honourable. Who has granted to You, Son of man, in the world to find repose? Who has granted to you, thing of dust, to be rich amidst poverty? Be not through desires needy and looking to others. Sufficient for you is your daily bread, that comes of the sweat of your face. Let this be (the measure of your need, that which the day gives you; and if you find for yourself a feast, take of it that which you need. You shall not take in a day (the provision) of days, for the belly keeps no treasure. Praise and give thanks when you are satisfied, that therein you provoke not the Giver to anger. In purity strengthen yourself, that you may gain from it profit. In everything give thanks and praise unto God as the Redeemer, that He may grant you by His grace, that we may hear and do His Will.
You to whom I have given the counsel of life, be not negligent in it. From that which is other men's (doctrine) have I written to you; see that you despise not their words. And if I depart before you, in your prayer make mention of me. In every season pray and beseech that our love may continue true. But as for us, on behalf of these things let us offer up praise and honour to Father, to Son, and to Holy Spirit, now and for ever. Amen.
Source: On Admonition and Repentance (New Advent)