In the vastness of the Cosmos there must be other civilizations far older and more advanced than ours.

Somewhere, something incredible is waiting to be known.

It is far better to grasp the universe as it really is than to persist in delusion, however satisfying and reassuring.

The nitrogen in our DNA, the calcium in our teeth, the iron in our blood, the carbon in our apple pies were made in the interiors of collapsing stars. We are made of starstuff.

Imagination will often carry us to worlds that never were. But without it we go nowhere.

I don't want to believe. I want to know.

The absence of evidence is not the evidence of absence.

The brain is like a muscle. When it is in use we feel very good. Understanding is joyous.

We live in a society exquisitely dependent on science and technology, in which hardly anyone knows anything about science and technology.

For small creatures such as we the vastness is bearable only through love.

You have to know the past to understand the present.

Discipline is for professionals. Motivation is for amateurs.

If you mess up, it's not your parents' fault, so don't whine about yourmistakes, learn from them.

There is no endeavor more noble than the attempt to achieve a collective dream.

To know others is to have knowledge. To know yourself is to be enlightened.

He hunched his shoulders and tried to make himself smaller in the seat. He wanted to disappear, to fade away, not to exist.

Be clever and do not build walls, because in the future they will bring only shame to you!

It turns out Cuba has this incredible healthcare system for a very poor country.

Between knowledge of what really exists and ignorance of what does not exist lies the domain of opinion. It is more obscure than knowledge, but clearer than ignorance.

The commonest weakness of our race is our ability to rationalize our most selfish purposes.

I brought a mirror to Lovers' Lane. I told everybody I'm Narcissus.