Praeparatio Evangelica (The Preparation of the Gospel)

'PLATO, Democritus: it is in the head as a whole.

'Straton: between the eyebrows.

'Erasistratus: about the membrane of the brain, which he calls the epicranis.

'Herophilus: in the cavity of the brain, which is also its base.

'Parmenides: in the breast as a whole.

'Epicurus, and all the Stoics: in the heart as a whole.

'Diogenes: in the arterial cavity of the heart, which is full of breath.

'Empedocles in the composition of the blood.

'Others in the membrane of the pericardium: and others in the diaphragm. Some of the more recent philosophers say that it reaches through from the head to the diaphragm.

'Pythagoras: the vital power is around the heart; but the rational , and intelligent faculty in the region of the head.'

So far, then, as to their opinions on these matters. Do you not think therefore that with judgement and reason we have justly kept aloof from the unprofitable and erroneous and vain labour of them all, and do not busy ourselves at all about the said subjects (for we do not see the utility of them, nor any tendency to benefit and gain good for mankind), but cling solely to piety towards God the creator of all things, and by a life of temperance, and all godly behaviour according to virtue, strive to live in a manner pleasing to Him who is God over all?

But if even you from malice and envy hesitate to admit our true testimony, you shall be again anticipated by Socrates, the wisest of all Greeks, who has truthfully declared his votes in our favour. Those meteorological babblers, for instance, he used to expose in their folly, and say that they were no better than madmen, expressly convicting them not merely of striving after things unattainable, but also of wasting time about things useless and unprofitable to man's life. And this shall be testified to you by our former witness Xenophon, one of the best-known of the companions of Socrates, who writes as follows in his Memorabilia: