Animals do neither good nor evil. They do as they must do.We may call what they do harmful or useful, but good and evil belong to us, who chose to choose what we do. [. . .] The animals need only be and do.We're yoked, and they're free. So to be with an animal is to know a little freedom.
Ursula K. Le GuinYou will die. You will not live forever. Nor will any man nor any thing. Nothing is immortal. But only to us is it given to know that we must die. And that is a great gift: the gift of selfhood. For we have only what we know we must lose, what we are willing to lose... That selfhood which is our torment, and our treasure, and our humanity, does not endure. It changes; it is gone, a wave on the sea. Would you have the sea grow still and the tides cease, to save one wave, to save yourself?
Ursula K. Le GuinWhat the brain does by itself is infinitely more fascinating and complex than any response it can make to chemical stimulation.
Ursula K. Le Guin