An observer situated in a nebula and moving with the nebula will observe the same properties of the universe as any other similarly situated observer at any time.

Religion divides us, while it is our human characteristics that bind us to each other.

[Science doesn't deal with facts; indeed] fact is an emotion-loaded word for which there is little place in scientific debate.

Time is that which is manufactured by clocks.

A theory is scientific only if it can be disproved. But the moment you try to cover absolutely everything the chances are that you cover nothing.

... an opportunity to allow the bees in one's bonnet to buzz even more noisily than usual.

[Newton's calculations] entered the marrow of what we know without knowing how we know it.

Our humanist attitude should therefore throughout be to stress what we all have in common with each other and relegate quarrelsome religion to the private domain where it can do [less] harm.

We find no sense in talking about something unless we specify how we measure it; a definition by the method of measuring a quantity is the one sure way of avoiding talking nonsense.

For when all else is done, on­ly words re­main. Words en­dure.

Temporary extreme fear while saying the truth is easy to overcome than the perpetual fear of the unspoken truth.

What's so funny 'bout peace, love, and world destruction?

The Tea Party we were told is only about economics; not true. It was always about economics and social issues. They just hid the social issues and now we just see who they really are.

Everything you do matters to all of us forever.

Wilderness is two things-fact and feeling. It is a fund of knowledge and a spring of influence. It is the ultimate source of health-terrestrial and human.

Writing humor is not something every single person can do.

This then is the first duty of an educator: to stir up life but leave it free to develop.

I look through the grave into heaven.

If reasons were as plentiful as blackberries, I would give no man a reason upon compulsion.