11 [In Migne, 10.] I will receive you with open hands and— if I may boast and speak foolishly like Hermagoras — I will strive to learn with you whatever you desire to study. Eusebius who is here regards you with the affection of a brother; he has made your letter twice as precious by telling me of your sincerity of character, your contempt for the world, your constancy in friendship, and your love to Christ. The letter bears on its face (without any aid from him) your prudence and the charm of your style.
Make haste then, I beseech you, and cut instead of loosing the hawser which prevents your vessel from moving in the sea. The man who sells his goods because he despises them and means to renounce the world can have no desire to sell them dear. Count as money gained the sum that you must expend upon your outfit. There is an old saying that a miser lacks as much what he has as what he has not. The believer has a whole world of wealth; the unbeliever has not a single farthing. Let us always live “as having nothing and yet possessing all things.” Food and raiment, these are the Christian's wealth. If your property is in your own power, sell it: if not, cast it from you.
“If any man...will take away your coat, let him have your cloke also.” You are all for delay, you wish to defer action: unless— so you argue— unless I sell my goods piecemeal and with caution, Christ will be at a loss to feed his poor. Nay, he who has offered himself to God, has given Him everything once for all. The apostles did but forsake ships and nets. The widow cast but two brass coins into the treasury and yet she shall be preferred before Crœsus with all his wealth. He readily despises all things who reflects always that he must die.
Source: Letters (New Advent)