This was written in the 12th Century by Moses Maimonedes, whose book, "The Guide of the Perplexed " is a formulative influence on Jewish thought and on the thinking of leading Christian writers and philosophers down through the seventeenth century. It is not a philosophical treatise,. Rather, it's aim is to liberate men from the tormenting perplexities arising from their understanding of the Bible according only to it's literary meaning.
I liked his writing about the four elements, where he says, "The state of things with regard to the generation and corruption of the elements and with regard to the generation of everything that is generated of them and is corrupted so as again to be changed into them, comes back in a circle similiar to the circular movement of heaven; so that the movement of this matter endowed with forms is, in respect to the succession of the forms subsisting in it, like the movement of heaven in respect to the "where" every part of heaven returning repeatedly to the selfsame positions. He mentions a fifth ruling body, which governs the four, which he says is the heart.