I don't know who my grandfather was; I'm much more concerned to know what his grandson will be.

People should pursue what they're passionate about. That will make them happier than pretty much anything else.

I don’t think we are going to become extinct. We are very clever and very resourceful.

People who say it cannot be done should not interrupt those who are doing it.

All the darkness in the world cannot extinguish the light of a single candle.

You're never as good as everyone tells you when you win, and you're never as bad as they say when you lose.

We are all motivated by a keen desire for praise, and the better a man is, the more he is inspired by glory.

Happiness depends more on the inward disposition of mind than on outward circumstances.

Character isn't something you were born with and can't change, like your fingerprints. It's something you weren't born with and must take responsibility for forming.

Look up at the stars and not down at your feet. Try to make sense of what you see, and wonder about what makes the universe exist. Be curious.

I hated every minute of training, but I said, 'Don't quit. Suffer now and live the rest of your life as a champion'.

You have brains in your head. You have feet in your shoes. You can steer yourself any direction you choose.

People throw stones at you and you convert them into milestones.

There is nothing in a caterpillar that tells you it's going to be a butterfly.

Courage isn't having the strength to go on - it is going on when you don't have strength.

Keep your face always toward the sunshine - and shadows will fall behind you.

Find out who you are and do it on purpose.

Don't just read the easy stuff. You may be entertained by it, but you will never grow from it.

Give yourself something to work toward - constantly.

The greatest accomplishment is not in never falling, but in rising again after you fall.

One of the things I learned when I was negotiating was that until I changed myself, I could not change others.