The Twelve Books of John Cassian on the Institutes of the Coenobia, and the Remedies for the Eight Principal Faults · Book IV. Of the Institutes of the Renunciants
Chapter XLII
Page 352 of 1,144
How a monk should not look for the blessing of patience in his own case as a result of the virtue of others, but rather as a consequence of his own longsuffering.
You should therefore not look for patience in your own case from the virtue of others, thinking that then only can you secure it when you are not irritated by any (for it is not in your own power to prevent this from happening); but rather you should look for it as the consequence of your own humility and long-suffering which does depend on your own will.
Nicene and Post-Nicene Fathers, Series II, Volume 11, ed. Philip Schaff and Henry Wace (1890–1900). Public domain. Text from the Christian Classics Ethereal Library.