Your work is going to fill a large part of your life, and the only way to be truly satisfied is to do what you believe is great work.

The greatest inventions are those which most directly meet the wants of mankind.

"We must constantly challenge our assumptions and be willing to change our minds."

If you just set out to be liked, you would be prepared to compromise on anything at any time, and you would achieve nothing.

Don't watch the clock; do what it does. Keep going.