You are not a realist unless you believe in miracles.

A wise man proportions his belief to the evidence.

The fact that an opinion has been widely held is no evidence whatever that it is not utterly absurd; indeed in view of the silliness of the majority of mankind, a widespread belief is more likely to be foolish than sensible.

All limitations are self-imposed.

Every man gives his life for what he believes. Every woman gives her life for what she believes. Sometimes people believe in little or nothing, nevertheless they give up their lives to that little or nothing. One life is all we have, and we live it as we believe in living it, and then it’s gone. But to surrender what you are, and live without belief - that’s more terrible than dying—more terrible than dying young.

There are only two kinds of people, those who accept dogmas and know it, and those who accept dogmas and don't know it.

I believe in Christianity as I believe that the sun has risen — not only because I see it, but because by it I see everything else.

What I wanted was to be allowed to do the thing in the world that I did best, which I believed then and believe now, is the greatest privilege there is. When I did that, success found me.