“I believe our future depends powerfully on how well we understand this Cosmos in which we float like a mote of dust in the morning sky.”
Source: Cosmos (1980), p. 4
Context: The size and age of the Cosmos are beyond ordinary human understanding. Lost somewhere between immensity and eternity is our tiny planetary home. In a cosmic perspective, most human concerns seem insignificant, even petty. And yet our species is young and curious and brave and shows much promise. In the last few millennia we have made the most astonishing and unexpected discoveries about the Cosmos and our place within it, explorations that are exhilarating to consider. They remind us that humans have evolved to wonder, that understanding is a joy, that knowledge is prerequisite to survival. I believe our future depends powerfully on how well we understand this Cosmos in which we float like a mote of dust in the morning sky.
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Carl Sagan 365
American astrophysicist, cosmologist, author and science ed… 1934–1996Related quotes

A Week on the Concord and Merrimack Rivers http://www.gutenberg.org/dirs/etext03/7cncd10.txt (1849), Saturday

The Aquarian Conspiracy (1980), Chapter Nine, Flying and Seeing: New Ways to Learn

[NewsBank, 3, Sarah Whitman, Age-old feud: In the beginning, Tampa Bay Times, Florida, February 7, 2014]

“We are the cosmos made conscious and life is the means by which the universe understands itself.”
Wonders of the Universe - Messengers

The statement "The future of all life, including our own, depends on our mindful steps." and much of the theme of this essay also occur later in his writings, including The World We Have : A Buddhist Approach to Peace and Ecology (2008), Ch. 1 : The Bells of Mindfulness, p. 3
The Sun My Heart (1996)
Context: All life is impermanent. We are all children of the Earth, and, at some time, she will take us back to herself again. We are continually arising from Mother Earth, being nurtured by her, and then returning to her. Like us, plants are born, live for a period of time, and then return to the Earth. When they decompose, they fertilize our gardens. Living vegetables and decomposing vegetables are part of the same reality. Without one, the other cannot be. After six months, compost becomes fresh vegetables again. Plants and the Earth rely on each other. Whether the Earth is fresh, beautiful, and green, or arid and parched depends on the plants.
It also depends on us. Our way of walking on the Earth has a great influence on animals and plants. We have killed so many animals and plants and destroyed their environments. Many are now extinct. In turn, our environment is now harming us. We are like sleepwalkers, not knowing what we are doing or where we are heading. Whether we can wake up or not depends on whether we can walk mindfully on our Mother Earth. The future of all life, including our own, depends on our mindful steps.

Cosmos: A Personal Voyage (1990 Update), The Shores of the Cosmic Ocean [Episode 1]
Context: We on Earth have just awakened to the great oceans of space and time from which we have emerged. We are the legacy of 15 billion years of cosmic evolution. We have a choice: We can enhance life and come to know the universe that made us, or we can squander our 15 billion-year heritage in meaningless self-destruction. What happens in the first second of the next cosmic year depends on what we do, here and now, with our intelligence and our knowledge of the cosmos.

Truman Library address (2006)
Context: I believe we have a responsibility not only to our contemporaries but also to future generations — a responsibility to preserve resources that belong to them as well as to us, and without which none of us can survive. That means we must do much more, and urgently, to prevent or slow down climate change. Everyday that we do nothing, or too little, imposes higher costs on our children and our children’s children. Of course, it reminds me of an African proverb — the earth is not ours but something we hold in trust for future generations. I hope my generation will be worthy of that trust.