If mind is common to us, then also the reason, whereby we are reasoning beings, is common.' If this be so, then also the reason which enjoins what is to be done or left undone is common. If this be so, law also is common; if this be so, we are citizens; if this be so, we are partakers in one constitution; if this be so, the Universe is a kind of Commonwealth.

IV, 4 (as translated by ASL Farquharson) - Meditations (c. 161–180 CE) - Book IV