The secret of creativity is knowing how to hide your sources.

The days are long, but the years are short.

The secret of joy in work is contained in one word - excellence. To know how to do something well is to enjoy it.

Total absence of humor renders life impossible.

What we have to do is to be forever curiously testing new opinions and courting new impressions.

Furious activity is no substitute for understanding.

Today might be a great and wonderful day. It depends on you.