Life is like riding a bicycle. To keep your balance, you must keep moving.
The creative principle [of science] resides in mathematics.
God has given me a mule-like stubbornness to stick with a difficult problem and the intuitive powers to conceptualize complex hypothetical situations in my mind.
Imagination is more powerful than knowledge.
Imagination is the highest form of research.
The more cruel the wrong that men commit against an individual or a people, the deeper their hatred and contempt for their victim.