He who refuses to embrace a unique opportunity loses the prize as surely as if he had failed.

If you wish to upset the law that all crows are black, you mustn't seek to show that no crows are; it is enough if you prove one single crow to be white.

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

A man with no philosophy in him is the most inauspicious and unprofitable of all possible social mates.

A thing is important if anyone think it important.

Thoughts become perception, perception becomes reality. Alter your thoughts, alter your reality.

A new position of responsibility will usually show a man to be a far stronger creature than was supposed.