Just like a turtle, we only make progress if we stick our neck out.

Therefore, a grotesque account of a period some thousands of years ago is taken seriously though it be built by piling special assumptions on special assumptions, ad hoc hypothesis [invented for a purpose] on ad hoc hypothesis, and tearing apart the fabric of science whenever it appears convenient. The result is a fantasia which is neither history nor science.

Every vital organization owes its birth and life to an exciting and daring idea.

The dignity of man is vindicated as much by the thinker and poet as by the statesman and soldier.

... scientific research is compounded of ... empirical procedures, general speculative ideas, and mathematical or abstract reasoning.

He who enters a university walks on hallowed ground.

Science is a dynamic undertaking directed to lowering the degree of the empiricism involved in solving problems; or, if you prefer, science is a process of fabricating a web of interconnected concepts and conceptual schemes arising from experiments and observations and fruitful of further experiments and observations.