If we are not able to ask skeptical questions, to interrogate those who tell us that something is true, to be skeptical of those in authority, then, we are up for grabs for the next charlatan (political or religious) who comes rambling along. Carl Sagan More Quotes by Carl Sagan More Quotes From Carl Sagan Our posturings, our imagined self-importance, the delusion that we have some privileged position in the universe, are challenged by this point of pale light. Our planet is a lonely speck in the great enveloping cosmic dark. Carl Sagan great universe light dark Even these stars, which seem so numerous, are as sand, as dust - or less than dust - in the enormity of the space in which there is nothing. Carl Sagan nothing sand space stars The dangers of not thinking clearly are much greater now than ever before. It's not that there's something new in our way of thinking - it's that credulous and confused thinking can be much more lethal in ways it was never before. Carl Sagan new confused way thinking We are the representatives of the cosmos; we are an example of what hydrogen atoms can do, given 15 billion years of cosmic evolution. Carl Sagan cosmos evolution example years Absence of evidence is not evidence of absence. Carl Sagan evidence absence We hunger to understand, so we invent myths about how we imagine the world is constructed - and they're, of course, based upon what we know, which is ourselves and other animals. So we make up stories about how the world was hatched from a cosmic egg or created after the mating of cosmic deities or by some fiat of a powerful being. Carl Sagan understand know powerful world You probably don't need more weapons than what's required to destroy every city on earth. There's only 2,300 cities. So, the United States, by that criteria, only needs 2,300 nuclear weapons - well, we've got more than 25,000! Carl Sagan need city you earth