At the root of the word discipline is the Latin discipulus, or pupil. It implies the existence of a student but also a teacher. This is the beauty of the relationship between Antoninus and Marcus Aurelius. One man, who, despite his self-interest, had the self-control and the kindness to be a tutor and mentor. The other was willing to learn, humble enough to be the disciple of a teacher of such self-discipline and goodness that after his death, he would be deified.
