The fidelity of a dog is a precious gift demanding no less binding moral responsibilities than the friendship of a human being.

All scientific knowledge to which man owes his role as master of the world arose from playful activities.

Humor and knowledge are the two great hopes of our culture.

It ought to be realized by all dog owners that obesity shortens a dog's life quite considerably, a life which is much too short anyhow.

Natural selection does not give any preference at all to anything that, in the long run, could be advantageous for the species but blindly rewards everything that, momentarily, affords greater procreative success.

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

The human soul is very much older than the human mind.