The opinion prevailed among advanced minds that it was time that belief should be replaced increasingly by knowledge; belief that did not itself rest on knowledge was superstition, and as such had to be opposed.

I cannot accept any concept of God based on the fear of life or the fear of death, or blind faith. I cannot prove to you that there is no personal God, but if I were to speak of him I would be a liar.

Small is the number of people who see with their eyes and think with their minds.

Our lives will be measured by what we do for others

Body and soul are not two different things, but only two different ways of perceiving the same thing. Similarly, physics and psychology are only different attempts to link our experiences together by way of systematic thought.

I have lived to prove Thoreau's contention that a man is rich in proportion to the number of things which he can afford to let alone.

The definition of genius is taking the complex and making it simple.