Your mind is your only strength; your reason is your only power.

This day I did come out of all my trouble. Nay I have cast out all my trouble; it should rather be for that which troubled thee, whatsoever it was, was not without anywhere that thou shouldest come out of it, but within in thine own opinions, from whence it must be cast out, before thou canst truly and constantly be at ease.

How the mind can participate in the sensations of the body and yet maintain its serenity, and focus on its own well-being.

O imagination, go away, I intreat thee by the gods, as thou didst come, for I want thee not. But thou art come according to thy old fashion. I am not angry with thee: only go away.

Within ten days thou wilt seem a god to those to whom thou art now a beast and an ape, if thou wilt return to thy principles and the worship of reason.

Suppose someone despises me. That's their concern, not mine. My concern is to live in harmony with nature and reason, so that my actions won't be worthy of contempt.

External things are not the problem. It's your assessment of them, which you can erase right now

As the senses naturally belong to the body, and the desires and affections to the soul, so do the dogmata to the understanding.

What is outside the scope of my mind has absolutely no concern with my mind. Learn this lesson and thou standest erect.

God give me patience to reconcile with what I am not able to change. Give me strength to change what I can. And give me wisdom to distinguish one from another.

The most noble thing is to be yourself.

Harbour no such opinions as he holds who does thee violence, or as he would have thee hold. See things in all their naked reality.