Rudaki

It is not manhood to kick one who has fallen; if you lift up a fallen one's hand, that is manhood.

Be content with what you are given and live justly; do not bind yourself in pretense, live free.

Favor and generosity are owed to no one, yet giving thanks for blessings is always owed; if the master did not fail in what was not required of him, how could I fail in what is required of me?