Richard Feynman

The first rule is not to fool yourself — and you are the easiest person to fool.

Never confuse education with intelligence. You can have a Ph.D. and still be an idiot.

Russ Davis (quoted by Chelton in the Russ Davis Memorial Symposium)

Don’t read a lot of papers. Most of them are worthless.

Those clowns have turned this into a cottage industry.

Lev Landau (quoted by Narlikar and Burbidge in Facts and Speculations in Cosmology)

Cosmologists are often wrong but never in doubt.