Regarding factory-farmed animals We owe them a merciful death, and we owe them a merciful life. And when human beings cannot do something humanely, without degrading both the creatures and ourselves, then we should not do it at all.

Perhaps that is part of the animals' role among us, to awaken humility, to turn our minds back to the mystery of things, and open our hearts to that most impractical of hopes in which all creation speaks as one.

Factory farming isn't just killing: It is negation, a complete denial of the animal as a living being with his or her own needs and nature. It is not the worst evil we can do, but it is the worst evil we can do to them.

When we call something unfair or indecent or unconscionable or evil, when we speak of mercy and pity and compassion, those words have meaning, regardless of our particular faith or moral philosophy. They appeal to common standards we all are expected to understand and accept, standards without which we could not live any common life at all.

When you start with a necessary evil, and then over time the necessity passes away, what's left?

Where we find wrongs done to animals, it is no excuse to say that more important wrongs are done to human beings, and let us concentrate on those. A wrong is a wrong, and often the little ones, when they are shrugged off as nothing, spread and do the gravest harm to ourselves and others.

If we are defined by reason and morality, then reason and morality must define our choices, even when animals are concerned. When people say, for example, that they like their veal or hot dogs too much to ever give them up, and yeah it's sad about the farms but that's just the way it is, reason hears in that the voice of gluttony. We can say that what makes a human being human is precisely the ability to understand that the suffering of an animal is more important than the taste of a treat.