As a general rule, people disappoint you as you know them.

There is no cosmetic for beauty like happiness.

We have a hunger of the mind which asks for knowledge of all around us, and the more we gain, the more is our desire; the more we see, the more we are capable of seeing.

Do not look at stars as bright spots only. Try to take in the vastness of the universe.

No woman should say, "I am but a woman!" But a woman! What more can you ask to be?

The world of learning is so broad, and the human soul is so limited in power! We reach forth and strain every nerve, but we seize only a bit of the curtain that hides the infinite from us.

Every formula which expresses a law of nature is a hymn of praise to God.

Besides learning to see, there is another art to be learned - not to see what is not.

We especially need imagination in science. Question everything.

I had only ordinary capacity but extraordinary persistency.

We especially need imagination in science. It is not all mathematics, nor all logic, but it is somewhat beauty and poetry.

I learn my life lessons from time rather than lesser mortals.

Anything in life worth having is worth working for.

That's what I liked about hitch-hiking. If a crowd wasn't big enough, I kept walkin.'

Presidents aren't supposed to spit, at least not obviously.

I have led a pretty colorful life.

In mythology, the Medusa can petrify people with a look - which is a good thing, I think. But the Medusa is a unique symbol - something strong. It’s about going all the way.

One has two duties - to be worried and not to be worried.

If we're not careful we spiritualize laziness.

A man's heart is a wretched, wretched thing. It isn't like a mother's womb. It won't bleed. It won't stretch to make room for you.

The greatest enemy of progress is not stagnation, but false progress.