Epictetus

"Every person you meet is your teacher if you are wise enough to listen."

"The only failure is failure to try."

"Seek to be a person of character before you seek to be a person of substance."

"What injures the mind impairs the mind; what builds the mind strengthens the mind."

"You cannot have freedom and comfort simultaneously."

"True love is the desire for another's well-being above your own."

"Your impression of an event determines its significance in your life."

"The man who is wise will not say 'I am wretched,' but 'This situation calls for wisdom.'"

"Progress is the act of abandoning your former self."

"In all things, ask yourself: is this within my control?"

"The test of a person is not how much they have, but how well they use what they have."

"You are always free to choose how you interpret your experience."

"The greatest chains are those we forge in our own minds."

"Disease of the mind is worse than disease of the body."

"The person who perfects themselves perfects the world."

"What is the nature of any good? It is virtue. What is the nature of any evil? It is vice."

"Stand firm in your principles, for they are all you truly own."

"The secret to life is making proper use of your impressions."

"You will be miserable as long as you believe yourself to be miserable."

"The greatest pleasure comes not from acquiring, but from needing little."

"Train yourself to say to every difficult experience: you are my material for virtue."

"The person who controls their appetites is freer than any king."

"Your freedom consists entirely in your power of choice."

"The obstacle is the way; use difficulties as stepping stones to greatness."

"What others think of you is none of your business."

"The universe conspires to help those who know what they want and work toward it."

"You will never be envied if you possess nothing, and you will never be pitied if you want nothing."

"The beginning of freedom is the realization that you are not your thoughts."

"If you wish to be a philosopher, you must relinquish the love of comfort."

"The good is what improves your character; the evil is what diminishes it."