Do not count your chickens before they are hatched.

A man should look for what is, and not what he thinks should be.

I don't think necessity is the mother of invention. Invention ... arises directly from idleness, possibly also from laziness. To save oneself trouble.

To succeed in your mission, you must have single-minded devotion to your goal.

You have to make the rules, not follow them.

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

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

Dare to be free, dare to go as far as your thought leads, and dare to carry that out in your life.

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.

Never stand begging for what one has the power to earn.

You have power over your mind - not outside events. Realize this, and you will find strength.

A painter should begin every canvas with a wash of black, because all things in nature are dark except where exposed by the light.

Sincerity and truth are the basis of every virtue.

Stand up to your obstacles and do something about them. You will find that they haven't half the strength you think they have.

There is always room at the top.

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

Aim for the highest.

My mission in life is not merely to survive, but to thrive; and to do so with some passion, some compassion, some humor, and some style

Imagination is everything. It is the preview of life's coming attractions.

Work gives you meaning and purpose and life is empty without it.

I will never be by violence constrained to do anything.