One can't teach a cat not to catch birds

Wisdom is not a product of schooling but of the lifelong attempt to acquire it.

Three Rules of Work: Out of clutter find simplicity. From discord find harmony. In the middle of difficulty lies opportunity.

In one's youth every person and every event appear to be unique. With age one becomes much more aware that similar events recur. Later on, one is less often delighted or surprised, but also less disappointed than in earlier years.

The creative principle [of science] resides in mathematics.

We are all life trying to live, among other life trying to live.

Do not grow old, no matter how long you live. Never cease to stand like curious children before the Great Mystery into which we were born.