"Waste no more time talking about great souls and how they should be. Become one yourself!"
-Marcus Aurelius

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

-Marcus Aurelius Antoninus Augustus

“Reject your sense of injury and the injury itself disappears.” 
-Marcus Aurelius Antoninus Augustus

"Look within. Within is the fountain of good, and it will ever bubble up, if thou wilt ever dig."
-Marcus Aurelius Antoninus Augustus

“Dwell on the beauty of life. Watch the stars, and see yourself running with them.”

-Marcus Aurelius

"The first rule is to keep an untroubled spirit. The second is to look things in the face and know them for what they are."
-Marcus Aurelius

"The Universe is change, life is an opinion." 

-Marcus Aurelius

"Never let the future disturb your life. You will meet it, if you have to, with the same weapons of reason which today arm you against the present."

-Marcus Aurelius Antoninus Augustus