(15) The same holds also of astronomy. For treating of the description of the celestial objects, about the form of the universe, and the revolution of the heavens, and the motion of the stars, leading the soul nearer to the creative power, it teaches to quickness in perceiving the seasons of the year, the changes of the air, and the appearance of the stars; since also navigation and husbandry derive from this much benefit, as architecture and building from geometry. This branch of learning, too, makes the soul in the highest degree observant, capable of perceiving the true and detecting the false, of discovering correspondences and proportions, so as to hunt out for similarity in things dissimilar; and conducts us to the discovery of length without breadth, and superficial extent without thickness, and an indivisible point, and transports to intellectual objects from those of sense.

(1) For to him knowledge (gnosis) is the principal thing. Consequently, therefore, he applies to the subjects that are a training for knowledge, taking from each branch of study its contribution to the truth. Prosecuting, then, the proportion of harmonies in music; and in arithmetic noting the increasing and decreasing of numbers, and their relations to one another, and how the most of things fall under some proportion of numbers; studying geometry, which is abstract essence, he perceives a continuous distance, and an immutable essence which is different from these bodies. And by astronomy, again, raised from the earth in his mind, he is elevated along with heaven, and will revolve with its revolution; studying ever divine things, and their harmony with each other; from which Abraham starting, ascended to the knowledge of Him who created them.

(1) Supposing we played a little before entering upon our serious concern and maintained that all things are striving after Contemplation, looking to Vision as their one end- and this, not merely beings endowed with reason but even the unreasoning animals, the Principle that rules in growing things, and the Earth that produces these- and that all achieve their purpose in the measure possible to their kind, each attaining Vision and possessing itself of the End in its own way and degree, some things in entire reality, others in mimicry and in image- we would scarcely find anyone to endure so strange a thesis. But in a discussion entirely among ourselves there is no risk in a light handling of our own ideas.

Well- in the play of this very moment am I engaged in the act of Contemplation?

Yes; I and all that enter this play are in Contemplation: our play aims at Vision; and there is every reason to believe that child or man, in sport or earnest, is playing or working only towards Vision, that every act is an effort towards Vision; the compulsory act, which tends rather to bring the Vision down to outward things, and the act thought of as voluntary, less concerned with the outer, originate alike in the effort towards Vision.

The case of Man will be treated later on; let us speak, first, of the earth and of the trees and vegetation in general, asking ourselves what is the nature of Contemplation in them, how we relate to any Contemplative activity the labour and productiveness of the earth, how Nature, held to be devoid of reason and even of conscious representation, can either harbour Contemplation or produce by means of the Contemplation which it does not possess.

(3) In addition, it will in my opinion form an appropriate sequel to defend those tenets, on account of which the Greeks assail us, making use of a few Scriptures, if perchance the Jew also may listen and be able quietly to turn from what he has believed to Him on whom he has not believed. The ingenuous among the philosophers will then with propriety be taken up in a friendly exposure both of their life and of the discovery of new dogmas, not in the way of our avenging ourselves on our detractors (for that is far from being the case with those who have learned to bless those who curse, even though they needlessly discharge on us words of blasphemy), but with a view to their conversion; if by any means these adepts in wisdom may feel ashamed, being brought to their senses by barbarian demonstration; so as to be able, although late, to see clearly of what sort are the intellectual acquisitions for which they make pilgrimages over the seas. Those they have stolen are to be pointed out, that we may thereby pull down their conceit; and of those on the discovery of which through investigation they plume themselves, the refutation will be furnished. By consequence, also we must treat of what is called the curriculum of study - how far it is serviceable; and of astrology, and mathematics, and magic, and sorcery. For all the Greeks boast of these as the highest sciences.

(5) "Philosophy," he said, "to him who heeds it, Noteth, not only in one place alone, After what manner Nature takes her course From Intellect Divine, and from its art; And if thy Physics carefully thou notest, After not many pages shalt thou find, That this your art as far as possible Follows, as the disciple doth the master; So that your art is, as it were, God's grandchild. From these two, if thou bringest to thy mind Genesis at the beginning, it behoves Mankind to gain their life and to advance; And since the usurer takes another way, Nature herself and in her follower Disdains he, for elsewhere he puts his hope. But follow, now, as I would fain go on, For quivering are the Fishes on the horizon, And the Wain wholly over Caurus lies, And far beyond there we descend the crag."

(3) The metaphysician, equipped by that very character, winged already and not like those others, in need of disengagement, stirring of himself towards the supernal but doubting of the way, needs only a guide. He must be shown, then, and instructed, a willing wayfarer by his very temperament, all but self-directed.

Mathematics, which as a student by nature he will take very easily, will be prescribed to train him to abstract thought and to faith in the unembodied; a moral being by native disposition, he must be led to make his virtue perfect; after the Mathematics he must be put through a course in Dialectic and made an adept in the science.

(2) But indications of this theory worthy of notice may be mentioned, by which it is possible for you, and those who resemble you, to be conducted by intellect to the essence of [real] beings. And with respect to such things as become known by a reasoning process, we shall leave no one of these without a perfect demonstration. But in all things we shall give to each that which is appropriate. And such questions, indeed, as are theological, we shall answer theologically; such as are theurgic, theurgically; but such as are philosophical, we shall, in conjunction with you, philosophically explore. Of these, also, such as extend to first causes, we shall unfold into light, by following them conformably to first principles. But such as pertain to morals, or to ends, we shall fitly discuss, according to the ethical mode. And, in a similar manner, we shall examine other things methodically and appropriately. Let us, therefore, now betake ourselves to your inquiries.