39. A person whose internal is in heaven's light, and whose external is in the world's light, thinks in both a spiritual and a natural fashion. But his spiritual thought then flows into his natural thought and is perceived there. However, a person whose internal together with his external is in the world's light thinks not in a spiritual but a material fashion; for his thought is based upon things present in Nature in the world, and these are all material. Thinking in a spiritual fashion is thinking about things as they really are, seeing truths by the light of truth, and perceiving what is good by the love for good; also seeing what things are like and perceiving affection for them in an abstract or immaterial fashion. But thinking in a material fashion is thinking, seeing and perceiving things together with matter, and in material form, so in a fashion which compared to the other is gross and obscure.