Carl Sagan

If intelligence is our only edge, we must learn to use it better, to shape it, to understand its limitations and deficiencies – to use it as cats use stealth, as katydids use camouflage – to make it the tool of our survival.

Carl Sagan

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

Carl Sagan

If the press descended, the science would surely suffer.

Carl Sagan

If we can’t think for ourselves, if we’re unwilling to question authority, then we’re just putty in the hands of those in power.

Carl Sagan

If we continue to accumulate only power and not wisdom, we will surely destroy ourselves.

Carl Sagan

If we ruin the earth, there is no place else to go.

Carl Sagan

If you are only skeptical, then no new ideas make it through to you.

Carl Sagan

If you want to make an apple pie from scratch, you must first create the universe.

Carl Sagan

In exchange for freedom of inquiry, scientists are obliged to explain their work.

Carl Sagan

In the deepest sense the search for extraterrestrial intelligence is a search for ourselves.

Carl Sagan