Social evolution may be the result of intention, but it rarely, if ever, produces the result intended.

Gauss replied, when asked how soon he expected to reach certain mathematical conclusions, that he had them long ago, all he was worrying about was how to reach them!

Sometimes the more measurable drives out the most important.

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.

Human diversity makes tolerance more than a virtue; it makes it a requirement for survival.

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.

...Search for the cause may be a hopeless pursuit because most disease states are the indirect outcome of a constellation of circumstances.