Meditations 10.37

Accustom thyself as much as possible on the occasion of anything being done by any person to inquire with thyself, For what object is this man doing this? But begin with thyself, and examine thyself first.

Marcus Aurelius, Meditations 10.37, translated by George Long

In every act of another habituate thyself as far as may be to put to thyself the question: What end has the man in view? But begin with thyself, cross-examine thyself first.

Marcus Aurelius, Meditations 10.37, translated by C. R. Haines