Perhaps nature is our best assurance of immortality.

Choose a challenge instead of competence

The only joy in this hard life is serving others.

There never has been security. No man has ever known what he would meet around the next corner; if life were predictable it would cease to be life, and be without flavor.

When you are genuinely interested in one thing, it will always lead to something else.

Nothing alive can stand still, it goes forward or back. Life is interesting only as long as it is a process of growth; or, to put it another way, we can only grow as long as we are interested.

I can't tell you how to succeed, but I can tell you how to fail: Try to please everybody.