211. From these things it can be established what the form of heaven is, namely, that it is the most perfect of all in the inmost heaven. In the middle heaven it is also perfect but in a lower degree, and in the outermost heaven in a still lower degree; also the form of one heaven has its permanent existence from another by means of influx from the Lord. But what communication by influx is cannot be understood unless it is known what degrees of height are, and how they differ from degrees of length and breadth. What these different degrees are may be seen above (n. 38).