Science is always discovering odd scraps of magical wisdom and making a tremendous fuss about its cleverness.

All phenomena of which we are aware take place in our own minds, and therefore the only thing we have to look at is the mind; which is a more constant quantity over all the species of humanity than is generally supposed.

I was asked to memorise what I did not understand; and, my memory being so good, it refused to be insulted in that manner.

Tell the truth, but lead so improbable a life that the truth will never be believed.

We can no longer assert any single proposition, unless we guard ourselves by enumerating countless conditions which must be assumed.

Practically, Science is true; and Faith is foolish.

The customer is usually wrong, but statistics indicate that it doesn't pay to tell him so