A blade of grass is a commonplace on Earth; it would be a miracle on Mars. Our descendants on Mars will know the value of a patch of green. And if a blade of grass is priceless, what is the value of a human being?

Carl Sagan
About This Quote

In this quote, Albert Einstein is saying that human life is so much more valuable than a blade of grass. The same way a blade of grass is so small in comparison to the Earth, so too is a human being in comparison to the world. To put it another way, a blade of grass can be destroyed and replaced, but a human being cannot be.

Source: Pale Blue Dot: A Vision Of The Human Future In Space

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