Thomas Henry Huxley

Zeal without knowledge is fire without light.

Learn what is true in order to do what is right.

Irrationally held truths may be more harmful than reasoned errors.

What we call rational grounds for our beliefs are often extremely irrational attempts to justify our instincts.

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

I am too much of a skeptic to deny the possibility of anything.

Science [...] commits suicide when it adopts a creed.

Every great advance in natural knowledge has involved the absolute rejection of authority.