The vast distances that separate the stars are providential. Beings and worlds are quarantined from one another. The quarantine is lifted only for those with sufficient selfknowledge and judgment to have safely traveled from star to star.
Carl Sagan
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Knowing a great deal is not the same as being smart; intelligence is not information alone but also judgment, the manner in which information is collected and used.
- Carl Sagan -
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Science is a way to call the bluff of those who only pretend to knowledge. It is a bulwark against mysticism against superstition against religion misapplied to where it has no business being.
- Carl Sagan