“Light is the only connection we have with the Universe beyond our solar system, and the only connection our ancestors had with anything beyond Earth. Follow the light and we can journey from the confines of our planet to other worlds that orbit the Sun without ever dreaming of spacecraft. To look up is to look back in time, because the ancient beams of light are messengers from the Universe's distant past.”

“When we gaze at a star in the Milky Way which is 50,000 light-years away from our sun, we are looking back 50,000 years in time.""The idea is much too big for my little head.""The only way we can look out into space, then, is to look back in time. We can never know what the universe is like now. We only know what it was like then. When we look up at a star that is thousands of light-years away, we are really traveling thousands of years back in the history of space.”

“The Cosmos extends, for all practical purposes, forever. After a brief sedentary hiatus, we are resuming our ancient nomadic way of life. Our remote descendants, safely arrayed on many worlds throughout the Solar System and beyond, will be unified by their common heritage, by their regard for their home planet, and by the knowledge that, whatever other life may be, the only humans in all the Universe come from Earth. They will gaze up and strain to find the blue dot in their skies. They will love it no less for its obscurity and fragility. They will marvel at how vulnerable the repository of all our potential once was, how perilous our infancy, how humble our beginnings, how many rivers we had to cross before we found our way.”

“We go from one darkness to another and in between, the hidden light of the world, of knowledge. We open our eyes and in this circle of light, we see not just ourselves but others who are our likenesses. This light tells us all men are brothers, but even brothers kill one another, and it is in this light where all this happens. But living in this dazzling light does not blind us to what lies beyond the darkness from where we emerged and where we are going. It is faith which makes our journey possible though it be marred by the unkindness of men, their eternal faulting, before we pass on to another darkness.”

“Authors can be divided into meteors, planets and fixed stars. The meteors produce a loud momentary effect; we look up, shout 'see there!' and then they are gone for ever. The planets and comets last for a much longer time....The fixed stars alone are constant and unalterable; their position in the firmament is fixed; they have their own light and are at all times active, because they do not alter their appearance through a change in our standpoint, for they have no parallax. Unlike the others, they do not belong to one system (nation) alone, but to the world. But just because they are situated so high, their light usually requires many years before it becomes visible to the inhabitatns of earth.”

“We are runaway slaves from our own past, and only by turning to face the hounds can we find our freedom beyond them.”