“The cure for a fallacious argument is a better argument, not the suppression of ideas.”

Your god is too small for my universe.

A galaxy is composed of gas and dust and stars – billions upon billions of stars. Every star may be a sun to someone.

One of the great commandments of science is: Mistrust arguments from authority.

Extinction is the rule. Survival is the exception.

I don’t want to believe. I want to know.

If we ruin the earth, there is no place else to go.

The significance of our lives and our fragile planet is then determined only by our own wisdom and courage.

All civilizations become either spacefaring or extinct.

If we continue to accumulate only power and not wisdom, we will surely destroy ourselves.

Across the sea of space, the stars are other suns.

You are worth about 3 dollars worth in chemicals.

We live on a mote of dust suspended in a sunbeam.

We can judge our progress by the courage of our questions and the depth of our answers, our willingness to embrace what is true rather than what feels good.

For me, it is far better to grasp the Universe as it really is than to persist in delusion, however satisfying and reassuring.

The visions we offer our children shape the future.

Nature is unsentimental. Death is built in.

You must force yourself to consider opposing arguments. Especially when they challenge your best loved ideas.

I never allow myself to have an opinion on anything that I don’t know the other side’s argument better than they do.

Equals argue – win or lose. Superiors just say it and win.

Let your words be of velvet and your arguments of the steel.

Of course poets have morals and manners of their own, and custom is no argument with them.

AIDS is an absolutely tragic disease. The argument about AIDS’ being some kind of divine retribution is crap.

When we argue for our limitations, we get to keep them.

Your feelings are valid but not every argument is.