202. The spiritual world has in it three heavens, arranged in order according to degrees of height. The highest heaven contains angels surpassing in every measure of perfection angels in the intermediate heaven; and the intermediate heaven contains angels surpassing in every measure of perfection angels in the lowest heaven. The degrees of their perfections are such that angels of the lowest heaven cannot ascend even to the first threshold of the perfections of angels in the intermediate heaven, nor these in turn to the first threshold of the perfections of angels in the highest heaven. This seems contrary to expectation, but still it is the truth. The reason for it is that associations of angels are formed in accordance with discrete degrees, and not in accordance with continuous degrees. [2] Through personal experience I have learned that such a difference in affections and thoughts, and consequently in speech, exists between angels of higher and lower heavens that they have nothing in common, and that their communication takes place solely by means of correspondences, correspondences which occur as a result of the Lord's direct influx into all of the heavens, and as a result of His indirect influx through the highest heaven into the lowest. [3] Because these differences are as stated, they cannot be expressed, nor therefore described, in any natural language; for the thoughts of angels, being spiritual, do not fall within the scope of natural ideas. They can be expressed and described only by angels themselves in their languages, forms of speech and writing, and not in human ones. This is the origin of the saying that in heaven one hears and sees things inexpressible.* These differences can be comprehended to some extent in light of the following observations, that the thoughts of angels in the highest or third heaven are thoughts of ends, that the thoughts of angels in the intermediate or second heaven are thoughts of causes, and that the thoughts of angels in the lowest or first heaven are thoughts of effects. [4] It must be noted that it is one thing to think in accord with ends and another to think about ends. So, too, that it is one thing to think in accord with causes and another to think about causes. And so also that it is one thing to think in accord with effects and another to think about effects. Angels in the lower heavens think about causes and ends, while angels in the higher heavens think in accord with causes and ends; and to think in accord with these is the mark of a higher wisdom, whereas to think about them is the mark of a lower wisdom. To think in accord with ends is the mark of wisdom; in accord with causes, the mark of intelligence; and in accord with effects, the mark of knowledge. It is apparent from this that every perfection ascends and descends concomitantly with degrees and in accordance with them. * Cf. 2 Corinthians 12:2-4.