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

Some of mankind's most terrible misdeeds have been committed under the spell of certain magic words or phrases.

Even the development of the steam engine owed but little to the advancement of science.

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.

Education is what is left after all that has been learnt is forgotten.