“Where we see the same faults followed regularly by the same misfortunes, we may reasonably think that if we could have known the first we might have avoided the others.”

“We might have known from the first that human curiosity is undying, and that the results we announced would be enough to spear others ahead on the same age-long pursuit of the unknown.”

“Whenever we proceed from the known into the unknown we may hope to understand, but we may have to learn at the same time a new meaning of the word 'understanding.”

“But there is one more reason to protect other species. One seldom if ever mentioned. Perhaps we are the first to talk and think and build and aspire, but we may not be the last. Others may follow us in this adventure. Some day we may be judged by just how well we served, when alone we were Earth’s caretakers.”

“Often we find our own destiny on the same roads that we have been avoiding.”

“We could never have loved the earth so well if we had had no childhood in it, if it were not the earth where the same flowers come up again every spring that we used to gather with our tiny fingers as we sat lisping to ourselves on the grass, the same hips and haws on the autumn hedgerows, the same redbreasts that we used to call ‘God’s birds’ because they did no harm to the precious crops. What novelty is worth that sweet monotony where everything is known and loved because it is known?”