I have found the missing link between the higher ape and civilized man: It is we.

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.

I believe that present day civilized man suffers from insufficient discharge of his aggressive drive.

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.