From Jacob Needleman & John P. Piazza's The Essential Marcus Aurelius:
The Stoics talk a good deal about the idea of the "care of the soul." In Marcus Aurelius, the word for "care" is therapeia (the English derivative from this is, of course, "therapy") - "also translated as 'tending' or 'service' . . . it reminds us that philosophy from the beginning was seen as a kind of healing through the redirection of one's attention to the soul."