Perhaps the depth of love can be calibrated by the number of different selves that are actively involved in a given relationship.
CARL SAGANThe significance of our lives and our fragile planet is then determined only by our own wisdom and courage.
More Carl Sagan Quotes
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The total number of stars in the Universe is larger than all the grains of sand on all the beaches of the planet Earth.
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Our ancestors lived out of doors. They were as familiar with the night sky as most of us are with our favorite television programs.
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Those at too great a distance may, I am well are, mistake ignorance for perspective.
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To live in the hearts we leave behind is to live forever.
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There are as many atoms in one molecule of DNA as there are stars in a typical galaxy.
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Every one of us is, in the cosmic perspective, precious. If a human disagrees with you, let him live. In a hundred billion galaxies, you will not find another.
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We are all stardust.
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If it can be destroyed by the truth, it deserves to be destroyed by the truth.
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We are a way for the cosmos to know itself.
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If you wish to make an apple pie from scratch, you must first invent the universe.
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Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works.
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All civilizations become either spacefaring or extinct.
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The Earth is the only world known so far to harbor life.
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We can judge our progress by the courage of our questions and the depth of our answers, our willingness to embrace what is true rather than what feels good.
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We are star stuff which has taken its destiny into its own hands.
CARL SAGAN