Carl Sagan

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

We are the local embodiment of a cosmos grown to self-awareness.

The price we pay for the suppression of doubt is that we can never be sure of anything.

The greatest discoveries are often made by accident.

It is an astonishing thing to be alive in the universe, and we should celebrate it every day.

The universe is full of mysteries waiting to be solved.

The notion that the pre-Copernican Earth was flat is a common misconception.

We are a way for the cosmos to contemplate itself.

The universe is not only stranger than we imagine, it is stranger than we can imagine.