[2] The situation with natural light and spiritual light is as follows. Natural light flows from the sun in the world, and spiritual light flows from the Sun in heaven, which is the Lord. All the truths of faith that a person has learned since early childhood come to be understood by him with the help of the kinds of objects, and the ideas formed from these, that originate in the light of the world. Thus every single thing is seen in a natural way; for as long as he lives in the world all the ideas constituting a person's thought are based on the kinds of things that exist in the world. If therefore these things are taken away from him his thought is totally destroyed. One who has not been regenerated has no knowledge at all of the existence of spiritual light, not even of the existence in heaven of a light that has nothing in common with the light of the world. Still less does that person know that spiritual light is what lights up ideas and objects that originate in the light of the world and is what enables a person to think, draw conclusions, and reflect on them. The reason such spiritual light enables him to do this is that that light is wisdom itself which goes forth from the Lord; and that wisdom manifests itself as the light which the angels in heaven see before them. That light renders visible every single thing beneath it, that is, every single thing present with a person which is a product of natural light. But the reverse does not happen unless the person has been regenerated, in which case the things that belong to heaven, that is, forms of goodness and truth, are lit up by spiritual light and become visible in the natural as if in a representative mirror.

[3] From this it is evident that the Lord, who is Light itself, sees every single thing present in a person's thought and will, and present indeed in the whole natural creation; nothing at all escapes His notice. From all this one may now recognize what is involved here - that natural light in which those truths dwell does not engender any belief that spiritual light renders all things visible, meant by the words 'they did not know that Joseph was hearing'. Much the same is implied by the statement above in verse 8, 'Joseph recognized his brothers and they did not recognize him'. For these words mean that the truths of the Church were seen by the celestial of the spiritual by the light it possessed, and that truth from the Divine was not seen in natural light that was not yet brightened with heavenly light; see 5427, 5428.