Now, therefore, since it has been seen what the true Philosophy is in its essence; which is that Lady of whom I speak; how her noble name through custom is communicated to the Sciences, and the first science is called the First Philosophy, I may proceed further with her praise. CHAPTER XII. In the first chapter of this treatise the reason which moved me to this Song is so fully discussed that it is no longer necessary to discuss it further, for one can easily enough recall to mind what has been said in this exposition: and therefore, following the divisions made for the Literal meaning, I shall run through the Song, turning back to the sense of the letter where it may be needful. I say, "Love, reasoning of my Lady in my mind." By Love I mean the labour and pains I took to acquire the love of this Lady. If one wishes to know what labour, it can be here considered in two ways. There is one study which leads the man to the daily use of Art and Science; there is another study which he will employ in the acquired use. The first is that which I call Love, which fills my mind continually with new and most exalted ideas of this Lady: even as the anxious pains which one takes to acquire a friendship are wont to do; for, when desiring that friendship, a man is wont to take anxious thought concerning it. This is that study and that affection which usually precedes in men the begetting of the friendship, when already on one side Love is born, and desires and strives that it may be on the other; for, as is said above, Philosophy is born when the Soul and Wisdom have become friends, so that the one is loved by the other. Neither is it again needful to discuss that first stanza in the present explanation, which was reasoned out as the Proem in the Literal exposition; since, from the first argument thereof, it is easy enough to make out the meaning in this the second one. We may proceed, then, to the second part, which begins the treatise, and to that place where I say, "The Sun sees not in travel round the Earth." Here it is to be known that as, when discoursing of a sensible thing, one handles it suitably by means of an insensible thing, so of an intelligible thing, one fitly argues by means of an unintelligible. In the Literal sense one speaks of the Sun as a substantial and sensible body; so now it is fit, by image of the Sun, to discourse of the Spiritual and Unintelligible, that is, God.