I don't sing because I'm happy; I'm happy because I sing.

The whole drift of my education goes to persuade me that the world of our present consciousness is only one out of many worlds of consciousness that exist.

Theory must mediate between all previous truths and certain new experiences

Equality is attainable as long as you are part of the majority.

There must be something solemn, serious, and tender about any attitude which we denominate religious. If glad, it must not grin or snicker; if sad, it must not scream or curse.

We have to live today by what truth we can get today and be ready tomorrow to call it falsehood.

The greatest discovery of the 20th Century is that our attitude of mind determines our quality of life, not circumstances.