Book XI · 26
In the writings of the [Ephesians]12 there was this precept, constantly to think of some one of the men of former times who practiced virtue.
In the writings of the Ephesians was laid down the advice to have constantly in remembrance some one of the ancients who lived virtuously.
Marcus Aurelius, Meditations XI.26. Translated by George Long (1862). The Stoic Library.