Man must rise above the Earth - to the top of the atmosphere and beyond - for only thus will he fully understand the world in which he lives.

We think too much and feel too little.

Freethinkers are those who are willing to use their minds without prejudice and without fearing to understand things that clash with their own customs, privileges, or beliefs. This state of mind is not common, but it is essential for right thinking.

My prodigious sin was, and still is, being a non-conformist.

Heaven, as conventionally conceived, is a place so inane, so dull, so useless, so miserable that nobody has ever ventured to describe a whole day in heaven, though plenty of people have described a day at the seaside.

The more things a man is ashamed of, the more respectable he is.