"More seriously still, the value commitments of the humane movement seem at bottom to betray a world-denying or rather a life-Ioathing philosophy. The natural world as actually constituted is one in which one being lives at the expense of others. Each organism, in Darwin's metaphor, struggles to maintain its own organic integrity. The more complex animals seem to experience Gudging from our own case, and reasoning from analogy appropriate and adaptive psychological accompaniments to organic existence. There is a palpable passion for self-preservation. There are desire, pleasure in the satisfaction of desires, acute agony attending injury, frustration, and chronic dread of death. But these experiences are the psychological substance of living. To live is to be anxious about life, to feel pain and pleasure in a fitting mixture, and sooner or later to die. That is the way the system works. If nature as a whole is good, then pain and death are also good."