There is no sadder sight in the world than to see a beautiful theory killed by a brutal fact.

There are savages without God in any proper sense of the word, but none without ghosts.

Size is not grandeur, and territory does not make a nation.

Irrationally held truths may be more harmful than reasoned errors.

It is not to be forgotten that what we call rational grounds for our beliefs are often extremely irrational attempts to justify our instincts.

Follow humbly wherever and to whatever abyss Nature leads, or you shall learn nothing.

The great tragedy of science - the slaying of a beautiful hypothesis by an ugly fact.