I have always sought to guide the future-but it is very lonely sometimes trying to play God.

You make me chuckle when you say that you are no longer young, that you have turned twenty-four. A man is or may be young to after sixty, and not old before eighty.

Any new formula which suddenly emerges in our consciousness has its roots in long trains of thought; it is virtually old when it first makes its appearance among the recognized growths of our intellect.

While we've youth in our hearts, we can never grow old.

Many ideas grow better when transplanted into another mind than in the one where they sprung up.

The greatest act of faith is when a man understands he is not God.

There are three natural anaesthetics: Sleep, fainting, and death.