Thus prepared, St. John is led on to learn the secrets of existence. "After this I looked, and, behold, a door was opened in heaven: and the first voice which I heard was as it were of a trumpet talking with me; which said, Come up hither, and I will shew thee things which must be hereafter." The messages to the seven spirits of the churches make known to St. John what is to take place in the physical world in order to prepare the way for Christianity. What he now sees "in the Spirit" takes him to the spiritual fountain-head of things, hidden behind physical evolution, but which will be realised, in a spiritualised age, in the near future, by means of physical evolution. The initiate experiences now in the spirit what is to happen in the future,--"And immediately I was in the spirit: and, behold, a throne was set in heaven, and one sat on the throne. And he that sat was to look upon like a jasper and a sardine stone: and there was a rainbow round about the throne, in sight like unto an emerald." In this way is described the source of things in the world of sense, in the pictures in which it appears to the seer. "And round about the throne were four and twenty seats: and upon the seats I saw four and twenty elders sitting, clothed in white raiment; and they had on their heads crowns of gold" (iv. 2-4). The beings far advanced on the path of wisdom thus surround the fountain-head of existence, to gaze on its infinite essence and bear testimony to it. "And in the midst of the throne, and round about the throne, were four beasts full of eyes before and behind. And the first beast was like a lion, and the second beast like a calf, and the third beast had a face as a man, and the fourth beast was like a flying eagle. And the four beasts had each of them six wings about him; and they were full of eyes within: and they rest not day and night, saying, Holy, holy, holy, Lord God Almighty, which was, and is, and is to come." It is not difficult to see that the four beasts represent the supersensible life underlying physical forms of life. Afterwards, when the trumpets sound, they lift up their voices, _i.e._, when the life expressed in sense-forms has been transmuted into spiritual life.