"The true measure of a man is not how he behaves in moments of comfort and convenience, but how he stands at times of controversy and challenge."

"The purpose of life is to live it, to taste experience to the utmost, to reach out eagerly and without fear for newer and richer experience."

"The future is open. It depends on us."

"Fear is the main source of the atrophy of the will, which is the main characteristic of the modern age."

"The world is not a machine. We are not cogs in a machine."