Search men's governing principles, and consider the wise, what they shun and what they cleave to.
You are a little soul bearing about a corpse, as Epictetus used to say.
The whole universe is change and life itself is but what you deem it
Happiness is no other than soundness and perfection of mind.
We are born for synergy, just like the feet, just like the hands, just like the eyes, just like the rows of upper and lower teeth. Working against each other is unnatural, and being annoyed and turning one's back is counterproductive.
Were you to live three thousand years, or even thirty thousand, remember that the sole life which a man can lose is that which he is living at the moment; and furthermore, that he can have no other life except the one he loses.