"Anyone who has never made a mistake has never tried anything new."
"The person who says it cannot be done, should not interrupt the person doing it"
"Imagination is more important than knowledge"
"If you would create something, you must be something."
Johann Wolfgang von Goethe
"It is difficult to say what is impossible, for the dream of yesterday is the hope of today and the reality of tomorrow."
Robert H. Goddard
"Our imagination is the only limit to what we can hope to have in the future."
Charles F. Kettering
"Nothing great was ever achieved without enthusiasm."
Ralph Waldo Emerson
"The future depends on what we do in the present."
"We are what we repeatedly do. Excellence, therefore, is not an act but a habit."
"Make no little plans; they have no magic to stir men's blood...Make big plans, aim high in hope and work."
Daniel H. Burnham
"There is no failure except in no longer trying."
"There is nothing like a challenge to bring out the best in man."
"The pessimist sees difficulty in every opportunity. The optimist sees the opportunity in every difficulty."
"In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual."
"The only medicine for suffering, crime, and all the other woes of mankind, is wisdom."