Our lives begin to end the day we become silent about things that matter.

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

The world is the great gymnasium where we come to make ourselves strong.

Only the wisest and stupidest of men never change.

It marks a big step in your development when you come to realize that other people can help you do a better job than you could do alone.

A bird doesn't sing because it has an answer, it sings because it has a song.

For every dark night, there's a brighter day

I believe that if you show people the problems and you show them the solutions they will be moved to act.

Yesterday is gone. Tomorrow has not yet come. We have only today. Let us begin.

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

Everything I've ever done was out of fear of being mediocre.

Neither seek nor avoid, take what comes.

The expectations of life depend upon diligence; the mechanic that would perfect his work must first sharpen his tools.

Change will not come if we wait for some other person, or if we wait for some other time. We are the ones we've been waiting for. We are the change that we seek.

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

Every problem is a gift - without problems we would not grow.

When you're curious, you find lots of interesting things to do.

Life is 10 percent what happens to you and ninety percent how you respond to it.

Our life is what our thoughts make it.

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

Somewhere, something incredible is waiting to be known.