People should be more like animals . . . they should be more intuitive; they should not be too conscious of what they do while they do it.

The only thing we can be certain of in this life is that we can be certain of nothing.

If you can't explain it simply, you don't understand it well enough.

If I would follow your advice and Jesus could perceive it, he, as a Jewish teacher, surely would not approve of such behavior.

No, this trick won't work... How on earth are you ever going to explain in terms of chemistry and physics so important a biological phenomenon as first love?

Gravitation is not responsible for people falling in love.

What is the meaning of human life, or of organic life altogether? To answer this question at all implies a religion.