Vegetarian philosophers

The first philosopher in the West to create a lasting vegetarian legacy was the Greek teacher Pythagoras. He was born on the island of Samos in 580 BCE and studied in what are now the countries of Greece, Egypt, and Iraq before establishing his school in southern Italy at the city of Croton. While Pythagoras is famous for his contributions to math, music, science, and philosophy, it is his philosophy that is of particular interest. He taught that all animals, not just humans, had souls, which were immortal and reincarnated after death. Since a human might become an animal at death, and an animal might become a human, Pythagoras believed that killing and eating non-human animals sullied the soul and prevented union with a higher form of reality. Additionally, he felt that eating meat was unhealthy and made humans wage war against one another. For these reasons, he abstained from meat and encouraged others to do likewise, perhaps making him one of the earliest campaigners for ethical vegetarianism.

A contemporary of Zeno’s was the philosopher Epicurus (341-270 BCE). Epicurus agreed that the universe was for humans. Spencer said Epicurus differed from the above philosophers by arguing that souls cease to exist at death; thus, death was nothing to fear. Another core element to his philosophy was a belief in the goodness of pleasure and the evil of pain. He thought that desire caused pain, and human dependence on temporary pleasures deprived them of true pleasure. Because of this belief, Epicurus did not eat meat as it was a luxury that distracted people from a better life. However, he made no prohibition against eating flesh, which allowed the practice to continue among adopters of his creed. While he lack a stated prohibition, his personal example illustrated what he thought was the ideal way to live.

Theophrastus (c. 372-c. 287 BCE), a Greek biologist and philosopher. Theophrastus argued that killing animals for food was wasteful and morally wrong. Hypothesizing as to the origin of flesh eating, he argued that war must have forced humans to eat meat by ruining the crops that they otherwise would have eaten. Unlike his teacher, Theophrastus proclaimed that animal sacrifices angered the gods and turned humanity towards atheism. Clearly, religious arguments have long been used as motivation to pursue a vegetarian diet.

Preserving the legacy of Pythagoras was the poet and moralist Ovid (43 BCE-17 CE). Ovid was a Pythagorean-influenced Stoic, who was exiled to Tomis in 8 CE by the emperor Augustus. In his poem Metamorphoses, Ovid evoked the passionate pleas of Pythagoras for people to abandon animal sacrifice and abstain from eating flesh. These passages kept the memory of Pythagoras alive and served as testament to Ovid’s own vegetarian lifestyle.

Influenced by Pythagoras and Epicurus, the Roman philosopher Seneca (c.4 ECB-65 CE) adopted a vegetarian diet. Spencer states that Seneca denounced the cruelty of games used by Rome to distract the citizenry and challenged the decadence of his time. Seneca was forced to hide his vegetarianism for a time under the emperor Caligula due to Caligula's distrust. Under the emperor Nero, his former student, Seneca was forced to commit suicide at age 60, due either to rumors in the court or Nero's jealousy.

Another Greek philosopher who argued on behalf of animals was the biographer and philosopher Plutarch (46-c. 120 CE). Influenced by Pythagorean philosophy, Plutarch adopted a vegetarian diet and wrote several essays in favor of vegetarianism as well as arguing that animals were rational and deserving of consideration. In particular, his essay On the Eating of Flesh is noteworthy for some arguments familiar to today’s vegetarians, such as the inefficiency of the human digestive system to handle flesh or the fact that humans lack the claws and fangs necessary for to the satisfaction of a carnivorous appetite. For these reasons, Plutarch is truly noteworthy as one of the earliest advocates of animal issues.

After Plutarch, the Greek philosopher Plotinus (205-270 CE) combined Pythagoreanism, Platonism, and Stoicism into a school of philosophy called Neoplatonism. He taught that all animals feel pain and pleasure, not just humans. According to Jon Gregerson, author of Vegetarianism: A History, Plotinus believed in order for humans to unite with the Supreme Reality, humans had to treat all animals with compassion. Seeking to practice what he preached, Plotinus avoided medicine made from animals. He allowed for the wearing of wool and the use of animals for farm labor, but he mandated humane treatment.

Continuing the work of Plotinus was the great Phoenician author and philosopher Porphyry (c. 232-c. 305 CE). He argued with observational and historical evidence in defense of vegetarianism and the rationality of animals. According to Spencer, in On the Impropriety of Killing Living Beings for Food, Porphyry argued meat eating encouraged violence, demonstrated the ability of animals to reason, and argued that justice should be extended to them. Like Plutarch, Porphyry ranks as one of the greatest voices for early Western vegetarianism.