If we examine the number six which is composed of two threes, if these two numbers are multiplied it is not the number six that is produced, but a different one, the number nine. (52) And the number four has many other powers also, which we must subsequently show more accurately in a separate essay appropriated to it. At present it is sufficient to add this that it was the foundation of the creation of the whole heaven and the whole world. For the four elements, out of which this universe was made, flowed from the number four as from a fountain. And in addition to the four elements the seasons of the year are also four, which are the causes of the generation of animals and plants, the year being divided into the quadruple division of winter, and spring, and summer, and autumn.
XVII. (53) The aforesaid number therefore being accounted worthy of such pre-eminence in nature, the Creator of necessity adorned the heaven by the number four, namely by that most beautiful and most godlike ornament the lightgiving stars. And knowing that of all existing things light is the most excellent, he made it the instrument of the best of all the senses, sight. For what the mind is in the soul, that the eye is in the body. For each of them sees, the one beholding those existing things which are perceptible only to the intellect, and the other those which are perceptible to the external senses. But the mind is in need of knowledge in order to distinguish incorporeal things, and the eyes have need of light in order to be able to perceive bodies, and light is also the cause of many other good things to men, and particularly of the greatest, namely philosophy. (54) For the sight being sent upwards by light and beholding the nature of the stars and their harmonious movement, and the well-ordered revolutions of the fixed stars, and of the planets, some always revolving in the same manner and coming to the same places, and others having double periods in an anomalous and somewhat contrary manner, beholding also, the harmonious dances of all these bodies arranged according to the laws of perfect music, causes an ineffable joy and delight to the soul. And the soul, feasting on a continuous series of spectacles, for one succeeds another, has an insatiable love for beholding such. Then, as is usually the case, it examines with increased curiosity what is the substance of these things which are visible; and whether they have an existence without having been created, or whether they received their origin by creation, and what is the character of their movement, and what the causes are by which everything is regulated. And it is from inquiries into these things that philosophy has arisen, than which no more perfect good has entered into human life.
XVIII. (55) But the Creator having a regard to that idea of light perceptible only by the intellect, which has been spoken of in the mention made of the incorporeal world, created those stars which are perceptible by the external senses, those divine and superlatively beautiful images, which on many accounts he placed in the purest temple of corporeal substance, namely in heaven. One of the reasons for his so doing was that they might give light; another was that they might be signs; another had reference to their dividing the times of the seasons of the year, and above all dividing days and nights, of months and years, which are the measures of time; and which have given rise to the nature of number. (56) And how great is the use and how great the advantage derivable from each of the aforesaid things, is plain from their effect. But with a view to a more accurate comprehension of them, it may perhaps not be out of place to trace out the truth in a regular discussion. Now the whole of time being divided into two portions day and night, the sovereignty of the day the Father has assigned to the Sun, as a mighty monarch: and that of the night he has given to the moon and to the multitude of the other stars. (57) And the greatness of the power and sovereignty of the sun has its most conspicuous proof in what has been already said: for he, being one and single has been allotted for his own share and by himself one half portion of all time, namely day; and all the other lights in conjunction with the moon have the other portion, which is called night. And when the sun rises all the appearances of such numbers of stars are not only obscured but absolutely disappear from the effusion of his beams; and when he sets then they all assembled together, begin to display their own peculiar brilliancy and their separate qualities.
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