The one excellent thing that can be learned from a lion is that whatever a man intends doing should be done by him with a whole-hearted and strenuous effort.

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

They alone live, who live for others.

I am not what happened to me, I am what I choose to become.

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.

Find out who you are. And do it on purpose.

People are capable, at any time in their lives, of doing what they dream of.

Ability is what you're capable of doing. Motivation determines what you do. Attitude determines how well you do it.

Don't complain about the snow on your neighbor's roof when your own doorstep is unclean.

Humans have come into being for the sake of each other, so either teach them, or learn to bear them.

You lose nothing when fighting for a cause ... In my mind the losers are those who don't have a cause they care about.

He was a dreamer, a thinker, a speculative philosopher... or, as his wife would have it, an idiot.

Whatever the mind of man can conceive and believe, it can achieve.

After climbing a great hill, one only finds that there are many more hills to climb.

They say Rome wasn't built in a day, but I wasn't on that particular job.

Do not count your chickens before they are hatched.

A man may die, nations may rise and fall, but an idea lives on.

I'd rather be an optimist and a fool than a pessimist and right.

If the only tool you have is a hammer, you tend to see every problem as a nail.

To give real service, you must add something which cannot be bought or measured with money.