3493. 'And his eyes were becoming dark so that he could not see' means when the Rational wished to enlighten the Natural from the Divine. This is clear from the meaning of 'the eyes' as interior or rational sight, dealt with in 2701, and from the meaning of 'seeing' as recognizing and understanding, dealt with in 2150, 2325, 2807. Consequently when 'the eyes' are said 'to be becoming dark' the meaning is that no discernment exists any longer, in this case no discernment of the things present in the natural. This being the meaning of these words, the fact that the Rational wished to enlighten the Natural from the Divine is meant. What this implies may be seen from the following things stated and shown already about the rational and the natural with man when he is being regenerated: The rational is regenerated before the natural, for the reason that the rational is interior and so closer to the Divine, and also is purer and so more suited to receiving the Divine than the natural is; and for the further reason that the natural has to be regenerated by way of the rational, see 3286, 3288, 3321.

[2] When therefore the rational has been regenerated but not the natural the former in that case seems to itself to be made dark, for no correspondence exists between the two. Actually the rational receives its sight from the light of heaven, whereas the natural receives its sight from the light of the world; but unless a correspondence exists between the two the rational is unable to see anything that is in the natural. Everything there is like shadow or even like thick darkness. But once a correspondence does exist, things that are in light in the natural are then apparent to the rational, for things that belong to the light of the world are then enlightened by those that belong to the light of heaven, which are so to speak shining through. But these matters are more clearly evident from what has been stated and shown already about correspondence see 2987, 2989-2991, 3002, 3138, 3167, 3222, 3223, 3225, 3337, 3485. Through what is stated and shown in these paragraphs one may grasp to some extent that the words 'Isaac's eyes were becoming dark so that he could not see' mean that the Rational wished to enlighten the Natural from the Divine, that is to say, to make even the Natural Divine, for the subject in the highest sense is the Lord. Light is thereby shed on this matter by what occurs with man when he is being regenerated and which has been described already; for man's regeneration is an image of the Lord's glorification, 3043, 3138, 3212, 3296, 3490.

3223. There are two forms of light that give light to man, the light of the world and the light of heaven. The light of the world comes from the sun, the light of heaven from the Lord. The light of the world is intended for the natural or external man, and so for things that exist within the natural man. Although these things do not appear to belong to that light, nevertheless they do, for the natural man is not able to grasp anything except by means of such things as occur and are visible in the world of the natural sun, thus unless they are given some visible form by the light and the shade of that world. All concepts of time and concepts of space, which in the natural man play so great a role that without them he is incapable of thought, belong also to the light of the world. The light of heaven however is intended for the spiritual or internal man. Man's interior mind, where his intellectual concepts reside that are called immaterial, belongs in that light. Of this no one is immediately conscious even though he refers to his intellect as sight and attributes light to it. The reason why he is not immediately conscious of it is that as long as he is engrossed in worldly and bodily interests his perception is solely of such things as belong to the light of the world and not of such as belong to the light of heaven. The light of heaven comes from the Lord alone, and the whole of heaven is bathed in that light.

[2] This light - the light of heaven - is immeasurably more perfect than the light of the world. Things which in the light of the world make a single ray make myriads in the light of heaven. The light of heaven holds intelligence and wisdom within it. This is the light which flows into the light of the world which shines in the external or natural man and causes the latter to perceive things with the senses. Unless the light of heaven were flowing in a person would have no discernment at all, for the life present in things which belong to the light of the world is received from that inflowing light. Between these two forms of light - that is, between things that belong to the light of heaven and those that belong to the light of the world - a correspondence exists when the external or natural man makes one with the internal or spiritual man, that is, when the external man is subservient to the internal. In this case things that occur in the light of the world are representative of such as occur in the light of heaven.