The most important pathological effects of pollution are extremely delayed and indirect.

Human life implies adventure, and there is no adventure without struggles and dangers.

Man could escape danger only by renouncing adventure, by abandoning that which has given to the human condition its unique character and genius among the rest of living things.

It is a disturbing fact that Western civilization, which claims to have achieved the highest standard of health in history, finds itself compelled to spend ever-increasing sums for the control of disease.

But too often the goal of the planners is a universal gray state of health corresponding to absence of disease rather than to a positive attribute conducive to joyful and creative living. This kind of health will not rule out and may even generate another form of ill, the boredom which is the penalty of a formula of life where nothing is left unforeseen.

Men are naturally most impressed by diseases which have obvious manifestations, yet some of their worst enemies creep on them unobtrusively.

With reference to life there is not one nature; there are only associations of states and circumstances, varying from place to place and from time to time.