We have fought long and hard to escape from medieval superstition. I, for one, do not wish to go back.

There is a distinct difference between having an open mind and having a hole in your head from which your brain leaks out.

I believe in the basic goodness of my species, because that appears to be a positive tactic and quality that leads to better chances of survival- and in spite of our foolishness, we seem to have survived.

Heroin also makes people feel better, but I wouldn't recommend using heroin.

People who are smart get into Mensa. People who are really smart look around and leave.

I do not expect that homeopathy will ever be established as a legitimate form of treatment, but I do expect that it will continue to be popular.

Those who believe without reason cannot be convinced by reason.