Answer me, you who believe that animals are only machines. Has nature arranged for this animal to have all the machinery of feelings only in order for it not to have any at all?
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.
If the bookseller happens to desire a privilege for his merchandise, whether he is selling Rabelais or the Fathers of the Church, the magistrate grants the privilege without answering for the contents of the book. - Voltaire (Francois Marie Arouet Voltaire