6 However, to return to the point from which I set out, I beseech you do not let me pass wholly out of sight and out of mind. A friend is long sought, hardly found, and with difficulty kept. Let those who will, allow gold to dazzle them and be borne along in splendor, their very baggage glittering with gold and silver. Love is not to be purchased, and affection has no price. The friendship which can cease has never been real. Farewell in Christ.
Source: Letters (New Advent)