“Imagination is the highest form of research.”

“Play is the highest form of research.”

“I believe in intuition and inspiration. Imagination is more important than knowledge. For knowledge is limited, whereas imagination embraces the entire world, stimulating progress, giving birth to evolution. It is, strictly speaking, a real factor in scientific research.”

“Morality is of the highest importance -- but for us, not for God.”

“If we knew what it was we were doing, it would not be called research, would it?”

“I maintain that the cosmic religious feeling is the strongest and noblest motive for scientific research.”

“I assert that the cosmic religious experience is the strongest and the noblest driving force behind scientific research.”