Is there anything so grave and serious as an ass?

It is far more probable that our senses should deceive us, than that an old woman should be carried up a chimney on a broom stick; and that it is far less astonishing that witnesses should lie, than that witches should perform the acts that were alleged.

I set forth notions that are human and my own, simply as human notions considered in themselves, not as determined and decreed by heavenly ordinance.

In order always to learn something from others (which is the finest school there can be), I observe in my travels this practice: I always steer those with whom I talk back to the things they know best.

We are born to inquire into truth; it belongs to a greater to possess it

In nine lifetimes, you'll never know as much about your cat as your cat knows about you.

Reason has so many forms that we do not know which to choose-Experiment has no fewer.