"To endure is the first thing that a man must learn if he is to achieve anything, or if he is to live at all."

"If a man is able to show me that I do not think or act right, I will gladly change; for I seek the truth, by which no man was ever injured. But he is injured who abides in his error and ignorance."

"The art of living is more like wrestling than dancing."

"It is in your power to withdraw yourself whenever you desire. Perfect tranquility is nothing more than the good ordering of the mind, the self-sufficiency which is within."

"The soul of man does violence to itself, first of all, when it becomes an abscess and, as it were, a tumour on the universe, so far as it can."