His disciple Pythagoras greatly confirmed this opinion, who came into Italy in the reign of Tarquin the Proud; and all that country which is called Great Greece was occupied by his school, and he himself was held in high honor, and had the greatest authority; and the Pythagorean sect was for many ages after in such great credit, that all learning was believed to be confined to that name.
XVII.

But I return to the ancients.

They scarcely ever gave any reason for their opinion but what could be explained by numbers or definitions.

It is reported of Plato that he came into Italy to make himself acquainted with the Pythagoreans; and that when there, among others, he made an acquaintance with Archytas[9] and Timaeus,[10] and learned from them all the tenets of the Pythagoreans; and that he not only was of the same opinion with Pythagoras concerning the immortality of the soul, but that he also brought reasons in support of it; which, if you have nothing to say against it, I will pass over, and say no more at present about all this hope of immortality.
_A._ What, will you leave me when you have raised my expectations so high?
I had rather, so help me Hercules! be mistaken with Plato, whom I know how much you esteem, and whom I admire myself, from what you say of him, than be in the right with those others.
_M._ I commend you; for, indeed, I could myself willingly be mistaken in his company.

Do we, then, doubt, as we do in other cases (though I think here is very little room for doubt in this case, for the mathematicians prove the facts to us), that the earth is placed in the midst of the world, being, as it were, a sort of point, which they call a [Greek: kentron], surrounded by the whole heavens; and that such is the nature of the four principles which are the generating causes of all things, that they have equally divided among them the constituents of all bodies; moreover, that earthy and humid bodies are carried at equal angles by their own weight and ponderosity into the earth and sea; that the other two parts consist, one of fire, and the other of air?
As the two former are carried by their gravity and weight into the middle region of the world, so these, on the other hand, ascend by right lines into the celestial regions, either because, owing to their intrinsic nature, they are always endeavoring to reach the highest place, or else because lighter bodies are naturally repelled by heavier; and as this is notoriously the case, it must evidently follow that souls, when once they have departed from the body, whether they are animal (by which term I mean capable of breathing) or of the nature of fire, must mount upward.