We don't laugh because we're happy - we're happy because we laugh.

We can change our circumstances by a mere change of our attitude.

Truth, as any dictionary will tell you, is a property of certain of our ideas. It means their agreement, as falsity means their disagreement, with reality.

The good or bad is not in the circumstance, but only in the mind...that encounters it.

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

Act as if what you do makes a difference. It does.

The god whom science recognizes must be a God of universal laws exclusively, a God who does a wholesale, not a retail business. He cannot accommodate his processes to the convenience of individuals.