4224. Organic forms consist not merely in those which are visible to the eye or which can be discovered by means of microscopes. Still purer organic forms exist which cannot possibly be discovered by any naked eye or any artificial device. These purer forms are more internal, such as the forms which belong to internal sight, and which in the end belong to the understanding. These are unsearchable, but are nevertheless forms, that is, substances, since no sight, not even intellectual sight, is possible except that which exists from something beyond itself. This is also well known in the learned world, that is to say, the point that without substance which is the subject, no mode, nor any modification, nor any quality which manifests itself in an active manner is possible. Those purer or more internal forms which are unsearchable are those which give rise to man's internal senses, as well as producing his interior affections. And these are the forms to which the interior heavens correspond since the interior heavens correspond to those internal senses and interior affections. But as there are very many things which have been disclosed to me concerning those heavens and their correspondence, they cannot be presented clearly unless each one is dealt with separately. For that reason, in the Lord's Divine mercy let the subject of the correspondence of man with the Grand Man begun in the previous volume be continued below. This will enable anyone to know, not on the basis of any reasoning, still less of any mere speculation, but from actual experience, about his own state of being, about his internal man which is called his soul, and lastly about how he is joined to heaven and through heaven to the Lord. He will then know about what it is that makes anyone a human being and what it is that marks him off from animals. In addition he will know about how a person separates himself from that conjunction with heaven and the Lord and joins himself to hell.