"About what am I now employing my own soul? On every occasion I must ask myself this question, and inquire, what have I now in this part of me which they call the ruling principle? And whose soul have I now? That of a child, or of a young man, or of a feeble woman, or of a tyrant, or of a domestic animal, or of a wild beast?"
'The Meditations' Marcus Aurelius, 167 A.D.