Youth is wasted on the young.

If history repeats itself, and the unexpected always happens, how incapable must Man be of learning from experience.

A fool's brain digests philosophy into folly, science into superstition, and art into pedantry. Hence University education.

I would like to take you seriously, but to do so would be an affront to your intelligence.

Friendship is held to be the severest test of character. It is easy, we think, to be loyal to a family and clan, whose blood is in your own veins.

My family didn't have a lot of money, and I'm grateful for that. Money is the longest route to happiness.

We always had National Geographic and Astronomy magazines and Popular Mechanics lying around the house. I got interested in exploration and different parts of the world and different parts of the universe just from seeing those things around the house and the different discussions we had as a family.

By protecting our Afghan friends from reprisals and welcoming them into our American family, we can assert that the United States is still a great and good country - and that we do not abandon those who risked their lives to serve with us.