More quotes by Marcus Aurelius, Meditations

"Everything we hear is an opinion, not a fact. Everything we see is a perspective, not the truth."
"If someone is able to show me that what I think or do is not right, I will happily change, for I seek the truth, by which no one was ever truly harmed. It is the person who continues in his self-deception and ignorance who is harmed."
"Never let the future disturb you. You will meet it, if you have to, with the same weapons of reason which today arm you against the present."
"The happiness of your life depends upon the quality of your thoughts: therefore, guard accordingly, and take care that you entertain no notions unsuitable to virtue and reasonable nature."
"You have power over your mind - not outside events. Realize this, and you will find strength."