"The purpose of this book is to discuss and present evidence for the general thesis that the flow of energy through a system acts to organize that system."

“All forms of life are related to each other, and the basic mechanisms that drive all of them are the same.”

“In the end, the abortion controversy comes down to one question: Will this particular pregnancy be terminated or not? There are only two possible choices, neither good. One is to abort the fetus. The other is to demand that the pregnancy be brought to term and, in effect, to compel the birth of an unwanted child. The second choice is repugnant to me. Not only does it entail real and immediate risks for the mother, but it may create a lifetime of misery for the child – misery that will, in all likelihood, persist for generations. Frankly, I can imagine fewer human acts more deeply evil than bringing an unwanted child into the world.”

“At the chemical level, human beings just aren’t all that different from pumpkins or any other life forms.”

“This type of answer is profoundly unsatisfying, but it’s about all you can expect if you ask the wrong question.”

“The fact that both you and the amoeba use these universal molecules in your energy metabolism is as striking an example of the relatedness of life as can be found.”

“While no one is going to make a decision on abortion purely on scientific grounds, we feel that everyone, at the very least, ought to get the facts straight.”