The Golden Sayings of Epictetus by Epictitus Part 4 Page 7

you are alone; for you are not alone, but God is within, and your Guardian Spirit, and what light do they need to behold what you do? To this God you also should have sworn allegiance, even as soldiers unto Caesar. They, when their service is hired, swear to hold the life of Caesar dearer than all else: and will you not swear your oath, that are deemed worthy of so many and great gifts? And will you not keep your oath when you have sworn it? And what oath will you swear? Never to disobey, never to arraign or murmur at aught that comes to you from His hand: never unwillingly to do or suffer aught that necessity lays upon you.

“Is this oath like theirs?”

They swear to hold no other dearer than Caesar: you, to hold our true selves dearer than all else beside.