Thinking is the hardest work we do.

Whether you believe you can or not, you're right.

I am looking for a lot of men who have an infinite capacity to not know what can't be done.

To live a great life, you must believe in yourself. Let these quotes help you to create a mindset for believing in yourself... Those who believe they can do something and those who believe they can't are both right.

If two people agree, one of them is unnecessary.

The object of education is not to fill a man's mind with facts; it is to teach him how to use his mind in thinking.

I don't expect to retire. Every man must work, that's his natural destiny.