"The mind is not a vessel to be filled, but a fire to be kindled."

"One can never consent to creep when one feels an impulse to soar."

"The struggle of life is a good struggle, and it is a struggle that we must all engage in."

"No pessimist ever discovered the secrets of the stars, or sailed to an unchartered land, or opened a new heaven to the human spirit."

"Security is mostly a superstition. It does not exist in nature."