Giuseppe Labriola

“Love is that condition in which the happiness of another person is essential to your own.”
― Robert A. Heinlein, Stranger in a Strange Land

“For every minute you are angry you lose sixty seconds of happiness.”
― Ralph Waldo Emerson

“I am free, no matter what rules surround me. If I find them tolerable, I tolerate them; if I find them too obnoxious, I break them. I am free because I know that I alone am morally responsible for everything I do.”
― Robert A. Heinlein

“Knowing yourself is the beginning of all wisdom.”
― Aristotle