"See how involved it gets? Clover, bees, nitrogen, escape speed, power, plant-animal balance, gas laws, compound interest laws, meteorology—a mathematical ecologist has to think of everything and think of it ahead of time. Ecology is explosive; what seems like a minor and harmless invasion can change the whole balance."

“Matt, you are suffering from a disease of youth—you expect moral problems to have nice, neat, black-and-white answers.”

“Clark just looked bored and contemptuous and said nothing, because Clark would not bother to interfere with Armageddon unless there was ten percent in it for him.”

“Learning isn’t a means to an end; it is an end in itself.”

“I used to wonder what it was like to be rich. Now I am and it turns out to be mostly headaches.”

“He seeks order, not truth. Suppose truth defies order, will he accept it? Will you? I think not.”

“Is it not better to be in ignorance than to believe falsely?”