# Quote — Carl Sagan, The Varieties of Scientific Experience

> When you look more generally at life on Earth, you find that it is all the same kind of life. ...It uses about fifty fundamental biological building blocks, organic molecules. ...with trivial exceptions, all organisms on Earth use... an enzyme, to control the rate and direction of the chemistry of life. ...a nucleic acid to encode the hereditary information ...the identical code book for translating nucleic acid language into protein language. ...At the molecular level, we are all virtually identical.

- Author: [Carl Sagan](https://www.leafyquotes.com/carl-sagan.md)
- Book: [The Varieties of Scientific Experience](https://www.leafyquotes.com/carl-sagan/the-varieties-of-scientific-experience.md)
- Source: [Wikiquote](https://en.wikiquote.org/wiki/Carl_Sagan#The_Varieties_of_Scientific_Experience:_A_Personal_View_of_the_Search_for_God_(2006)) ([CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/))
- Quote page: https://www.leafyquotes.com/carl-sagan/the-varieties-of-scientific-experience/when-you-look

## More from this book

> Let's say there's a molecule that produces a religious experience... a natural molecule that the body produces whose function it is to produce religious experiences, at least on occasion? ...So let's call it "theophorin"...What could the selective advantage of theophorin be? ...to suit us for the quest that was, according to Dostoyevsky, to strive for nothing so incessantly and so painfully as to find someone to worship and obey.

[Quote page](https://www.leafyquotes.com/carl-sagan/the-varieties-of-scientific-experience/lets-say-theres.md)

> There is a very stunning range of studies... of interstellar organic matter... the cold, dark spaces between the stars are also loaded with organic matter. ...complex organic materials are everywhere.

[Quote page](https://www.leafyquotes.com/carl-sagan/the-varieties-of-scientific-experience/there-is-a-very.md)

> Now, it is sometimes said that people who take a skeptical approach to UFOs or ancient astronauts or indeed some varieties of revealed religion are engaging in prejudice. I maintain that this is not prejudice. It is postjudice. That is, not a judgement made before examining the evidence but a judgement made after examining the evidence.

[Quote page](https://www.leafyquotes.com/carl-sagan/the-varieties-of-scientific-experience/now-it-is-sometimes.md)