Book VII · 17
Eudaemonia [happiness] is a good daemon, or a good thing. What then art thou doing here, O imagination? Go away, I entreat thee by the gods, as thou didst come, for I want thee not. But thou art come according to thy old fashion. I am not angry with thee: only go away.
Marcus Aurelius, Meditations VII.17. Translated by George Long (1862). The Stoic Library.