Life is entrusted to man as a treasure which must not be squandered, as a talent which must be used well.

Others have seen what is and asked why. I have seen what could be and asked why not.

I'm not telling you it's going to be easy - I'm telling you it's going to be worth it.

I confess that in 1901 I said to my brother Orville that man would not fly for fifty years.

Winners and losers aren't born, they are the products of how they think

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

I have always found that mercy bears richer fruits than strict justice.

We do not consider our principles as dogmas contained in books said to come from heaven. We derive our inspiration, not from heaven, or the unseen world, but directly from life.

If we want a free and peaceful world, if we want to make the deserts bloom and man grow to greater dignity as a human being-we can do it.

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

Pizza makes me think that anything is possible.

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

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

Be not ashamed women, ... You are the gates of the body, and you are the gates of the soul.

I can be changed by what happens to me. But I refuse to be reduced by it.

I will never be by violence constrained to do anything.

When we see men of a contrary character, we should turn inwards and examine ourselves.

Only the wisest and stupidest of men never change.

Motivation is what gets you started. Habit is what keeps you going.

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

Once you learn to quit, it becomes a habit.