"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."
"The best revenge is not to be like your enemy."
"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."
"Everything we hear is an opinion, not a fact. Everything we see is a perspective, not the truth."
"Very little is needed to make a happy life; it is all within yourself in your way of thinking."
"Perfection of character is this: to live each day as if it were your last, without frenzy, without apathy, without pretence."