Book VIII · 2
On the occasion of every act ask thyself, How is this with respect to me? Shall I repent of it? A little time and I am dead, and all is gone. What more do I seek, if what I am now doing is the work of an intelligent living being, and a social being, and one who is under the same law with God?
In every action ask thyself, How does it affect me? Shall I regret it? But a little and I am dead and all that lies between is past. What more do I ask for, as long as my present work is that of a living creature, intelligent, social, and under one law with God?
Marcus Aurelius, Meditations VIII.2. Translated by George Long (1862). The Stoic Library.