At a certain age some people's minds close up; they live on their intellectual fat.

Whenever it is in any way possible, every boy and girl should choose as his life work some occupation which he should like to do anyhow, even if he did not need the money.

Marriage is a fine and sacred thing if you make it so.

In a start-up company, you basically throw out all assumptions every three weeks.

How essential it is in youth to acquire some intellectual or artistic tastes, in order to furnish the mind, to be able to live inside a mind with attractive and interesting pictures on the walls.

The principle of happiness should be like the principle of virtue: it should not be dependent of things, but be a part of personality [and character].

I find daily life not always joyous, but always interesting. I have some sad days and nights, but none that are dull. As I advance deeper into the vale of years, I live with constantly increasing gusto and excitement. I am sure it all means something; in the last analysis, I am an optimist because I believe in God. Those who have no faith are quite naturally pessimists and I do not blame them.