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

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

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

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

I am certainly not one of those who need to be prodded. In fact, if anything, I am the prod.

If one does not know to which port one is sailing, no wind is favorable.

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

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

It's not what you pay a man, but what he costs you that counts.

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