The minute a man ceases to grow, no matter what his years, that minute he begins to be old.

The deepest principle in human nature is the craving to be appreciated.

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

In the deepest heart of all of us there is a corner in which the ultimate mystery of things works sadly.

I am no lover of disorder and doubt as such. Rather do I fear to lose truth by this pretension to possess it already wholly.

Choose a self and stand by it.

Ninety-nine hundredths or, possibly, nine hundred and ninety-nine thousandths of our activity is purely automatic and habitual, from our rising in the morning to our lying down each night.