Epictetus quotes
There is only one way to happiness and that is to cease worrying about things which are beyond the power or our will. 
If anyone tells you that a certain person speaks ill of you, do not make excuses about what is said of you but answer, "He was ignorant of my other faults, else he would not have mentioned these alone." 
Don't explain your philosophy. Embody it. 
Man is not worried by real problems so much as by his imagined anxieties about real problems 
Freedom is the only worthy goal in life. It is won by disregarding things that lie beyond our control.