If we have learned anything from the liberation movements, we should have learned how difficult it is to be aware of the ways in which we discriminate until they are forcefully pointed out to us. A liberation movement demands an expansion of our moral horizons, so that practices that were previously regarded as natural and inevitable are now seen as intolerable.
Peter Singer, Ethics Into Action: Henry Spira and the Animal Rights Movement
animals, equality, liberation, oppression, vegan, veganism