Book VI · 39
Adapt thyself to the things with which thy lot has been cast: and the men among whom thou hast received thy portion, love them, but do it truly [sincerely].
Fit thyself to the environment that is thy portion, and love the men among whom thy lot is thrown, but whole-heartedly.
Marcus Aurelius, Meditations VI.39. Translated by George Long (1862). The Stoic Library.