Tertullian

“ In the first place, (we must determine) whether there be in the soul some supreme principle of vitality and intelligence [1] which they call “the ruling power of the soul”—τὸ ἡγεμονικόν for if this be not admitted, the whole condition of the soul is put in jeopardy. Indeed, those men who say that there is no such directing faculty, have begun by supposing that the soul itself is simply a nonentity. ”

“ One Dicæarchus, a Messenian, and amongst the medical profession Andreas and Asclepiades, have thus destroyed the (soul’s) directing power, by actually placing in the mind the senses, for which they claim the ruling faculty. Asclepiades rides rough-shod over us with even this argument, that very many animals, after losing those parts of their body in which the soul’s principle of vitality and sensation is thought mainly to exist, still retain life in a considerable degree, as well as sensation: as in the case of flies, and wasps, and locusts, when you have cut off their heads ”

“ However, Dicæarchus has several authorities against him—and philosophers too—Plato, Strato, Epicurus, Democritus, Empedocles, Socrates, Aristotle; whilst in opposition to Andreas and Asclepiades (may be placed their brother) physicians Herophilus, Erasistratus, Diocles, Hippocrates, and Soranus himself; and better than all others, there are our Christian authorities. ”