“Humans are currently the dominant species on earth and exercise a great deal of power and control over nature. But very few believe might makes right, so the fact that we have greater power cannot enter into a justification of our use and treatment of animals. Rather, where other beings are under our power, we should feel obligated to show self-restraint and to act out of mercy and compassion. We cannot avoid causing harm to other beings in the process of living our own lives. Nor does morality consist in trying to be perfect and pure. But we can adopt an orientation toward minimizing the amount of harm we cause and taking full responsibility for it, seeing it for what it is. To justify animal experimentation is to start at one end of a continuum. Much of what we do will be morally acceptable (in our eyes), and we will chip away at the extremity where what we do shades into cruelty. I no longer believe that a general moral justification of animal experimentation can be given.”

" Animal Experimentation: A Philosopher's Changing Views https://digitalcommons.calpoly.edu/cgi/viewcontent.cgi?article=1609&context=bts" (1987), in Between the Species, vol. 3, iss. 2, p. 59.