Carl Sagan

The notion that the universe was created in 6 days, or 6,000 years, or 6 million years, is a kind of cosmic provincialism.

If we are to survive, we must be willing to change our minds.

The most profound joy and the most profound terror are not far apart.

An extraterrestrial intelligence, if it exists, would be far more likely to contact us through radio waves than by flying saucers.

The suppression of uncomfortable ideas may be common in religion and politics, but it is not the way to do science.

We are starstuff, contemplating the stars.

The only way to avoid error is to be silent.

To be able to think for ourselves is a profound privilege.

The universe is a machine for the making of gods.

If we are to survive, we must be willing to change our minds and our ways.

We are like a tiny boat in a vast ocean, and the only way to navigate is with the stars.

The most important thing is not to stop questioning. Curiosity has its own reason for existence.

The universe is not a divine clockwork, but a grand, evolving drama.

The only way to do great work is to love what you do.

The universe is full of wonders, and we are just beginning to explore them.

The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge.

We are privileged to live in an age when the universe is revealing its secrets.