When a person's interior sight - the sight of his spirit - is opened, he then sees things in the next life, things that can never be manifested before his bodily eyes. The visions that the prophets had were nothing else. As has been stated, representatives of the Lord and of His kingdom, as well as meaningful signs, are to be seen constantly, so much so that nothing ever comes before the eyes of angels that is not a representative or a meaningful sign. This is the origin of representatives and of meaningful signs in the Word, for the Word derives from the Lord through heaven.