We had better dispense with the personification of evil, because it leads, all too easily, to the most dangerous kind of war: religious war.

Every danger loses some of its terror once its causes are understood.

I consider early childhood events as most essential to a man's scientific and philosophical development.

Most of the vices and mortal sins condemned today correspond to inclinations that were purely adaptive or at least harmless in primitive man.

From a neighbour, I got a one-day-old duckling and found, to my intense joy, that it transferred its following response to my person. At the same time, my interest became irreversibly fixated on water fowl, and I became an expert on their behaviour even as a child.

The bond with a true dog is as lasting as the ties of this earth will ever be.