Meditations 7.54

Everywhere and at all times it is in thy power piously to acquiesce in thy present condition, and to behave, justly to those who are about thee, and to exert thy skill upon thy present thoughts, that nothing shall steal into them without being well examined.

Marcus Aurelius, Meditations 7.54, translated by George Long

At all times and in all places it rests with thee both to be content with thy present lot as a worshipper of the Gods, and to deal righteously with thy present neighbours, and to labour lovingly at thy present thoughts, that nothing unverified should steal into them.

Marcus Aurelius, Meditations 7.54, translated by C. R. Haines