Barking dogs may occasionally bite, but laughing men hardly ever shoot!

There is no faith which has never yet been broken, except that of a truly faithful dog

Visualize yourself confronted with the task of killing, one after the other, a cabbage, a fly, a fish, a lizard, a guinea pig, a cat, a dog, a monkey and a baby chimpanzee. In the unlikely case that you should experience no greater inhibitions in killing the chimpanzee than in destroying the cabbage or the fly, my advice to you is to commit suicide at your earliest possible convenience, because you are a weird monstrosity and a public danger.

...he who has seen the intimate beauty of nature cannot tear himself away from it again. He must become either a poet or a naturalist and, if his eyes are keen and his powers of observation sharp enough, he may well become both.

Few animals display their mood via facial expressions as distinctly as cats.

In nature we find not only that which is expedient, but also everything which is not so inexpedient as to endanger the existence of the species.

Evil, by definition, is that which endangers the good, and the good is that which we perceive as a value.