"There can be no compromise on basic principles. There can be no compromise on moral issues. There can be no compromise on matters of knowledge, of truth, of rational conviction."

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My aim is to advocate that we make this mental switch in respect of our attitudes and practices towards a very large group of beings: members of species other than our own - or, as we popularly though misleadingly call them, animals. In other words, I am urging that we extend to other species the basic principle of equality that most of us recognize should be extended to all members of our own species.

— Peter Singer