Bonaventure

Also by the law of fidelity and special friendship; for which reason he adds: Because my friend has come to me from a journey, and I have nothing to set before him; and so by the fidelity of friendship I am bound to him, and through this, you also to me; whence Ecclesiasticus 22: "Keep faith with a friend in his poverty, that you may rejoice in his prosperity. In the time of his tribulation remain faithful to him, that in his inheritance you may be a co-heir."

Commentary on Luke, Chapter 11 ↗