In this world nothing can be said to be certain, except death and taxes.

It usually takes me more than three weeks to prepare a good impromptu speech.

Business is never so healthy as when, like a chicken, it must do a certain amount of scratching around for what it gets.

No enterprise is more likely to succeed than one concealed from the enemy until it is ripe for execution.

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

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

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.

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

Most of the important things in the world have been accomplished by people who have kept on trying when there seemed to be no hope at all.