There are no secrets to success. It is the result of preparation, hard work, and learning from failure.

Effort only fully releases its reward after a person refuses to quit.

I think that there is nothing, not even crime, more opposed to poetry, to philosophy, ay, to life itself than this incessant business.

The hardest thing to understand in the world is the income tax.

Sometimes when you innovate, you make mistakes. It is best to admit them quickly, and get on with improving your other innovations.

An economist's guess is liable to be as good as anybody else's.

Sometimes when you innovate, you make mistakes. It is best to admit them quickly, and get on with improving your other innovations.

If you cannot work with love but only with distaste, it is better that you should leave your work.

Whenever you find yourself on the side of the majority, it is time to pause and reflect.

If you listen to your fears, you will die never knowing what a great person you might have been.