"The universe is a stream of things, a river of events. Some things are born, others die. Some things are in motion, others at rest. Some things are changing, others are constant. Some things are good,…"

"It is in your power to withdraw yourself whenever you desire. Perfect tranquility is nothing more than the good ordering of the mind, the self-sufficiency which is within."

"Do not waste the remainder of thy life in thoughts about others, when thou dost not refer thy thoughts to some object of common utility. For thou wilt lose thy opportunity for doing anything else."

"The universe is transformation; life is opinion."

"If you are distressed by anything external, the pain is not due to the thing itself, but to your estimate of it; and this you have the power to revoke at any moment."