"All the many brands of suppression - racism, sexism, heterosexism, ageism, classism - are historical; they have not been always with us. It was not ever thus. And it's not going to be this way, come the revolution!"

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Just as we reject racism, sexism, ageism, and heterosexism, we reject speciesism. The species of a sentient being is no more reason to deny the protection of this basic right than race, sex, age, or sexual orientation is a reason to deny membership in the human moral community to other humans.

— Gary L. Francione