We do not need to eat animals, wear animals, or use animals for entertainment purposes, and our only defense of these uses is our pleasure, amusement, and convenience.

In order to be a teacher you've got to be a student first

We can no more justify using nonhumans as human resources than we can justify human slavery. Animal use and slavery have at least one important point in common: both institutions treat sentient beings exclusively as resources of others. That cannot be justified with respect to humans; it cannot be justified with respect to nonhumans—however “humanely” we treat them.

People need to be educated so that they can make intelligent moral choices

To say that a being who is sentient has no interest in continuing to live is like saying that a being with eyes has no interest in continuing to see. Death—however “humane”—is a harm for humans and nonhumans alike.