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.

The wooing of the Earth thus implies much more than converting the wilderness into humanized environments. It means also preserving natural environments in which to experience mysteries transcending daily life and from which to recapture, in a Proustian kind of remembrance, the awareness of the cosmic forces that have shaped humankind.

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

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

Pathological states are the consequence of several determinate factors acting simultaneously...The manifestations of any given agent differ profoundly from one person to another. ...Each noxious agent can express itself by a great variety of different pathological states. ...Different agents can elicit similar reactions. ...The total environment and the (interior medium) constitute a multifactorial system.

Life is short, the art is long, the problems pressing.

Wherever human beings are concerned, trend is not destiny.