"I continue to believe that this world has no ultimate meaning. But I know that something in it has a meaning and that is man, because he is the only creature who insists on having one."

"What is happiness? The feeling that power is growing, that resistance is overcome."

"In the depth of winter, I finally learned that within me there lay an invincible summer."

"The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion."

"If I had to write a book on ethics, it would have a hundred pages. Ninety-nine of them would be blank. On the last page I would write: 'I recognize only one duty, and that is to love.'"