"Our greatest glory is not in never falling but in rising every time we fall."
"Failure comes only when we forget our ideals and objectives and principles."
"Courage is doing what you're afraid to do. There can be no courage unless you're scared."
"There is nothing like a challenge to bring out the best in man."
"The difference between a successful person and others is not a lack of strength, not a lack of knowledge, but rather a lack in will."
"Life is a challenge, meet it"
"In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual."
"Don't be afraid to challenge the pros, even in their own backyard."
"The power of imagination makes us infinite."
"Nothing great was ever achieved without enthusiasm."
Ralph Waldo Emerson
"The only way of finding the limits of the possible is by going beyond them into the impossible."
Arthur C. Clarke
"Man's greatness lies in his power of thought."
"Anyone who has never made a mistake has never tried anything new."
"Wherever we look upon this earth, the opportunities take shape within the problems."
Nelson A. Rockefeller
"If there is no wind, row."