"Cruelty to animals is an enormous injustice; so is expecting those on the lowest rung of the economic ladder to do the dangerous, soul-numbing work of slaughtering sentient beings on our behalf."

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People must have renounced, it seems to me, all natural intelligence to dare to advance that animals are but animated machines.... It appears to me, besides, that such people can never have observed with attention the character of animals, not to have distinguished among them the different voices of need, of suffering, of joy, of pain, of love, of anger, and of all their affections. It would be very strange that they should express so well what they could not feel.

— Voltaire