"Life is a game, play it well."

"The world is not given, it is made."

"The only way to make sense of change is to plunge into it, move with it, and join the dance."

"One's life has value so long as one attributes value to the life of others, by means of love, friendship, indignation and compassion."

"I know of no other experience more thrilling than to be at the heart of a debate, to be part of the current of ideas."