By reason whereof, so long as our understanding shall leave it selfe to be cleansed by the fire of Divine love, he will ever keep its living and luminous brightnesse. But if it suffer it selfe foolishly to go after exterior light, it shall be also obscured and extinguished with the interiour which domineers over it, even as a small candle or wax taper with the twinckling beames of a cleare shining Summer Sunne. Sith then this sensible light, saith Saint _Thomas_ upon the 36. of _Job_, by the absolute Omnipotency of God, who disposeth it as he pleaseth, it is sometimes hid to mortals, sometimes communicated; from whence we may gather that there is another light more perfect and excellent, namely the spiritual, which God reserves for a recompence of good works, following that which _Job_ sets downe, God covereth the light in his hands, and ordaineth it that it should returne againe and manifest it self. He sheweth it to those he loveth, that they may well mount unto it. Whereto that of _Zoroastres_ word for word was conformable. You must mount up to the true light and to the bright beams of your father, from whom the soul was sent you, revested with much intellect. Behold the relations of these Sunnes the sensible and intelligible, and of the two lights that proceed therefrom. For as that of the Sunne obtains the first place in corporall things, saith Saint _Augustine_ in his book of freewill, and that by means thereof, the interiour communicate with the superiour, the same doth the light of the spirituall Sun in regard of intelligibles. There are also things that have heat, and no light, as that of Animals of quick chalk besprinkled with water, horse and pigeon dung, which _Galen_ writes, he hath seen to wax a fire of it selfe, heapes of oats, and other graines, except Barly, new wines which boil, the lees in the vintage, heaps of Olives, Apples, and Peares, which is a kind of putrefaction, whence also there is engendred some strange heat, as we see in Apostemaes, and in flesh which begins to bee corrupted; and on the contrary wee see others that have light and no heat; as worms that glister in the night, and of little flies that fly in the dark in summer time; of shels and scales of fish, in rotten wood, in stones, and in the eyes of ravenous beasts. _Suidas_ speaking of the visible and invisible, this said he, cannot wel be expressed in words; it is as little flyes which flye in the summer, which by displaying their wings, fly into the eyes with small sparkling fires; the worms also that shine in the night, the shels and scales of some fishes, and other the like, which cannot be perceived in the light, but very well in the darke, for the fire which so shineth from them in the dark, is not a colour, whose property is to make it seene at the brightnesse of the Sunne, or other light, because that the air being transparent and deprived of all colours, the sight might very easily pierce it, and passe through to apprehend them.