Carl Sagan said this quote

“ It is very difficult to evolve by altering the deep fabric of life, any change there is likely to be lethal. But fundamental change can be accomplished by the addition of new systems on top of old ones. ”

Famous Quotes of Carl Sagan

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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.

~ Carl Sagan

The cosmos is within us. We are made of star-stuff. We are a way for the universe to know itself.

~ Carl Sagan

The Cosmos is all that is or was or ever will be. Our feeblest contemplations of the Cosmos stir us -- there is a tingling in the spine, a catch in the voice, a faint sensation, as if a distant memory, of falling from a height. We know we are approaching the greatest of mysteries.

~ Carl Sagan

A celibate clergy is an especially good idea, because it tends to suppress any hereditary propensity toward fanaticism.

~ Carl Sagan