Some people don't like change, but you need to embrace change if the alternative is disaster.

Only in the darkness, you are able to see the stars.

Duty does not require any person to submit to the destruction of his personal ambitions and the right to live his own life in his own way.

Isn't it astonishing that all these secrets have been preserved for so many years just so we could discover them!

Wealth is not about having a lot of money; it's about having a lot of options.

I invented my life by taking for granted that everything I did not like would have an opposite, which I would like.

Don't fear failure. Not failure, but low aim, is the crime. In great attempts it is glorious even to fail.

A superior man is modest in his speech, but exceeds in his actions.

Lend yourself to others, but give yourself to yourself.

No great discovery was ever made without a bold guess.

As long as I'm in great shape, nobody beats me, for sure.

When I was in college, I wanted to be involved in things that would change the world.

The marble not yet carved can hold the form of every thought the greatest artist has.

Effort only fully releases its reward after a person refuses to quit.

Keep your eyes on the stars, and your feet on the ground.

Repetition of the same thought or physical action develops into a habit which, repeated frequently enough, becomes an automatic reflex.

You'll never do a whole lot unless you're brave enough to try.

If I find 10,000 ways something won't work, I haven't failed. I am not discouraged, because every wrong attempt discarded is another step forward.

When they say the sky's the limit to me that's really true

I discover myself on the verge of a usual mistake.

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