20, 21.

Julian in Caesar.] The virtue of Marcus Aurelius Antoninus was of severer and more laborious kind.

[45] It was the well-earned harvest of many a learned conference, of many a patient lecture, and many a midnight lucubration.
At the age of twelve years he embraced the rigid system of the Stoics, which taught him to submit his body to his mind, his passions to his reason; to consider virtue as the only good, vice as the only evil, all things external as things indifferent.

[46] His meditations, composed in the tumult of the camp, are still extant; and he even condescended to give lessons of philosophy, in a more public manner than was perhaps consistent with the modesty of sage, or the dignity of an emperor.

[47] But his life was the noblest commentary on the precepts of Zeno.