“The upshot of all this is that we live in a universe whose age we can't quite compute, surrounded by stars whose distances we don't altogether know, filled with matter we can't identify, operating in conformance with physical laws whose properties we don’t truly understand.”

“We know not whether laws be right Or whether laws be wrong All we know who lie in gaol Is that the walls are strong And each day is like a year A year whose days are long.”

“And boyhood is a summer sun / Whose waning is the dreariest one-- / For all we live to know is known, / And all we seek to keep hath flown--”

“What an irony it is that these living beings whose shade we sit in,whose fruit we eat, whose limbs we climb, whose roots we water, towhom most of us rarely give a second thought, are so poorlyunderstood. We need to come, as soon as possible, to a profoundunderstanding and appreciation for trees and forests and the vitalrole they play, for they are among our best allies in the uncertainfuture that is unfolding.”

“It used to be obvious that the world was designed by some sort of intelligence. What else could account for fire and rain and lightning and earthquakes? Above all, the wonderful abilities of living things seemed to point to a creator who had a special interest in life. Today we understand most of these things in terms of physical forces acting under impersonal laws. We don't yet know the most fundamental laws, and we can't work out all the consequences of the laws we do know. The human mind remains extraordinarily difficult to understand, but so is the weather. We can't predict whether it will rain one month from today, but we do know the rules that govern the rain, even though we can't always calculate their consequences. I see nothing about the human mind any more than about the weather that stands out as beyond the hope of understanding as a consequence of impersonal laws acting over billions of years.”

“We did that often, asking each other questions whose answers we already knew. Perhaps it was so that we would not ask the other questions, the ones whose answers we did not want to know.”