St. Maximus the Confessor: In time of trial do not leave your monastery but stand up...

In time of trial do not leave your monastery but stand up courageously against the thoughts that surge over you, especially those of irritation and listlessness. 

For when you have been tested by afflictions in this way, according to divine providence, your hope in God will become firm and secure. But if you leave, you will show yourself to be worthless, unmanly and fickle.

St. Maximus the Confessor