Carl Sagan

"Friendship is forged through shared wonder."

"Family gives us roots and wings."

"Success is measured by contribution to humanity."

"Creativity is problem-solving with imagination."

"Justice requires both passion and reason."

"Money should serve humanity, not rule it."

"We are all connected through the cosmos."

"The pursuit of happiness begins with purpose."

"Every atom in our bodies was forged in a star."

"The cosmos is a vast living body, of which we are still parts. The sun feeds the earth. The earth feeds us. Everything is interconnected."

"Science is not only compatible with spirituality; it is a profound source of spirituality."

"For small creatures such as we, the vastness is bearable only through love."

"One of the saddest lessons of history is this: If we've been bamboozled long enough, we tend to reject any evidence of the bamboozle."

"The capacity to change is the capacity to survive."

"We are made of star stuff, and the atoms in our bodies were forged in the furnaces of distant stars."

"Somewhere, something incredible is waiting to be known."

"All civilizations become either spacefaring or extinct."

"The brain is a committee of experts. All that we are, all our knowledge and beliefs, are there because of it."

"We are a way for the cosmos to know itself."

"In the vastness of space and immensity of time, it is my joy to share a planet and an epoch with you."

"Science demands evidence. But so do I. I would be delighted to see the evidence."

"The universe is not hostile, nor is it friendly. It is indifferent."

"Education is the most powerful tool we have to change the world."

"Absence of evidence is not evidence of absence."

"If we are to survive, our loyalties must be broad—to our species and the planet."

"We live in a society exquisitely dependent on science and technology and yet the scientific literacy is sinking."

"The known is finite, the unknown infinite; spiritually we stand on an islet in the midst of a boundless ocean."

"Books are like seeds. If you plant them, they will grow into something beautiful."

"An organism that eats its own supplies will die. So will a civilization."

"There may be life out there in the universe which is also trying to make sense of it all."