Marcus Aurelius: “On the occasion of every act ask thyself, How is this with respect to me?”

For every judgment and movement and desire and aversion is within, and no evil ascends so high.

It is thy duty to leave another man's wrongful act there where it is (vii. 29; ix. 38).

Be cheerful also, and seek not external help nor the tranquillity which others give.

In the morning when thou risest unwillingly, let this thought be present,--I am rising to the work of a human being.