I fear this is not the right exchange to attain virtue, to exchange pleasures for pleasures, pains for pains and fears for fears, the greater for the less like coins, but that the only valid currency for which all these things should be exchanged is wisdom.

Evil is the vulgar lover who loves the body rather than the soul, inasmuch as he is not even stable, because he loves a thing which is in itself unstable, and therefore when the bloom of youth which he was desiring is over, he takes wing and flies away, in spite of all his words and promises; whereas the love of the noble disposition is life-long, for it becomes one with the everlasting.

From a short-sided view, the whole moving contents of the heavens seemed to them a parcel of stones, earth and other soul-less bodies, though they furnish the sources of the world order.

I have hardly ever known a mathematician who was capable of reasoning.

I must yield to you, for you are irresistible.

If one sins against the laws of proportion and gives something too big to something too small to carry it - too big sails to too small a ship, too big meals to too small a body, too big powers to too small a soul - the result is bound to be a complete upset. In an outburst of hubris the overfed body will rush into sickness, while the jack-in-office will rush into the unrighteousness that hubris always breeds.

The most effective kind of education is that a child should play amongst lovely things.