"I must say a word about fear. It is life's only true opponent. Only fear can defeat life."

The essence of mathematics lies in its freedom.

Human beings are not born once and for all on the day their mothers give birth to them, but life obliges them over and over again to give birth to themselves.

"To love is to risk not being loved in return. To hope is to risk pain. To try is to risk failure, but risk must be taken because the greatest hazard in life is to risk nothing."

The past is a ghost, the future a dream, and all we ever have is now.