“You have to know the past to understand the present.”

I think the health of our civilization, the depth of our awareness about the underpinnings of our culture and our concern for the future can all be tested by how well we support our libraries.

Don’t judge everyone else by your own limited experience.

The total number of stars in the Universe is larger than all the grains of sand on all the beaches of the planet Earth.

People are not stupid. They believe things for reasons.

There are as many atoms in one molecule of DNA as there are stars in a typical galaxy.

Stars are phoenixes, rising from their own ashes.

There are as many atoms in one molecule of DNA as there are stars in a typical galaxy.

Stars are phoenixes, rising from their own ashes.

The cure for a fallacious argument is a better argument, not the suppression of ideas.

Where we have strong emotions, we’re liable to fool ourselves.

Every one of us is, in the cosmic perspective, precious. If a human disagrees with you, let him live. In a hundred billion galaxies, you will not find another.

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

An atheist is someone who is certain that God does not exist, someone who has compelling evidence against the existence of God.

The only thing we’ve found that makes the emptiness bearable, is each other.

Exploration is in our nature. We began as wanderers, and we are wanderers still. We have lingered long enough on the shores of the cosmic ocean. We are ready at last to set sail for the stars.

If it can be destroyed by the truth, it deserves to be destroyed by the truth.

If everyone is thinking alike, then somebody isn’t thinking.

At the end of the day, whether or not those people are comfortable with how you’re living your life doesn’t matter. What matters is whether you’re comfortable with it.

We are what we pretend to be, so we must be careful about what we pretend to be.

The test of the morality of a society is what it does for its children.

The truth doesn’t have versions, it just is.

I love life, but not everything in it. I love people, but not all of them. I love myself, but not everything about me.

I miss you deeply, unfathomably, senselessly, terribly.

Most men are not wicked, They are sleep-walkers, not evil evildoers.