Jean-Jacques Rousseau on Vegetarianism

“It appears therefore that man, having teeth and intestines like frugivorous animals, should naturally be placed in that class. And not only do anatomical observations confirm this opinion, but the monuments of antiquity are also very favorable to it. “Dicaearchus,” says St. Jerome, “relates in his books on Greek antiquities that under the reign of Saturn, when the earth was still fertile by itself, no man ate flesh, but that all lived on fruits and vegetables that grew naturally.” ... From this one can see that I am neglecting several advantageous considerations that I could turn to account. For since prey is nearly the exclusive subject of fighting among carnivorous animals, and since frugivorous animals live among themselves in continual peace, if the human species were of this latter genus, it is clear that it would have had a much easier time subsisting in the state of nature, and much less need and occasion to leave it.”

“The indifference of children towards meat is one proof that the taste for meat is unnatural; their preference is for vegetable foods, such as milk, pastry, fruit, etc. Beware of changing this natural taste and making children flesh-eaters, if not for their health's sake, for the sake of their character; for how can one explain away the fact that great meat-eaters are usually fiercer and more cruel than other men; this has been recognised at all times and in all places. The English are noted for their cruelty while the Gaures are the gentlest of men. All savages are cruel, and it is not their customs that tend in this direction; their cruelty is the result of their food. They go to war as to the chase, and treat men as they would treat bears. Indeed in England butchers are not allowed to give evidence in a court of law, no more can surgeons. Great criminals prepare themselves for murder by drinking blood. Homer makes his flesh-eating Cyclops a terrible man, while his Lotus-eaters are so delightful that those who went to trade with them forgot even their own country to dwell among them.”