I submit to you that if a man hasn't discovered something that he will die for, he isn't fit to live. Martin Luther King, Jr.
Someday, after mastering the winds, the waves, the tides and gravity, we shall harness for God the energies of love, and then, for a second time in the history of the world, man will have discovered fire. Pierre Teilhard de Chardin
No pessimist ever discovered the secret of the stars, or sailed to an uncharted land, or opened a new doorway for the human spirit. Helen Keller