[12] for these last see only the surfaces of the things presented to them, and require light from without to enable them to do that, but the intellect penetrates into the inmost recesses of bodies, closely surveying and investigating the whole of them, and each separate part, and also the natures of those incorporeal things, which the external senses are unable to contemplate at all. For the mind may almost be said to possess all the acuteness of vision of the eye, without being in need of any spurious light, but being in itself a star, and as it were a sort of representation or copy of the heavenly bodies: