420. Upon the earth, nor upon the sea, nor upon any tree, signifies everywhere in the spiritual world, even to its ultimates, in those who have any perception. This is evident from the signification of "the earth," as being the whole spiritual world, consequently all angels and spirits there. This is the signification of "the earth" in the general and nearest sense, because in the spiritual world, the same as on our globe, there are lands, mountains, hills, plains, valleys, and also seas (respecting which see above, n. 304, 342, 413). It is evident also from the signification of the "sea," as being the ultimates of the earth in the spiritual world, because the last boundaries or limits there are seas (respecting which see above, n. 342); also from the signification of "tree," as being perception and also knowledge (of which presently). This being the signification of "earth," "sea," and "tree," the three joined together in one idea signify all things in the spiritual world even to its ultimates in those who have any perception. A "tree" in general signifies perception and knowledge, because a "garden" signifies intelligence, and all intelligence is according to knowledges and a perception of them; this is why each kind of tree signifies something pertaining to knowledge [scientia] and intelligence. Because a "tree" signifies in general perception and knowledge, it also signifies the interiors of the mind with man, and also the whole man; for a man is such as are the interiors that belong to his mind, and these are such as is the perception from knowledges. (That a "tree" signifies the interiors that belong to the mind, and also man himself, see above, n. 109, 110; that a "tree" signifies perception and knowledge, see Arcana Coelestia 103, 2163, 2682, 2722, 2972, 7692; that the ancients had Divine worship in groves under trees, according to their significations, n. 2722, 4552; that this was prohibited with the Jewish nation, and why, n. 2722; that "paradises" and "gardens" signify intelligence, n. 100, 108, 3220; also in the work on Heaven and Hell 176; and above, n. 110)

3889. To enable me to know not only that there is a correspondence of celestial things, which are those of love, with the motions of the heart, and of spiritual things, which are those of faith derived from love, with the motions of the lungs, but also the nature of this correspondence, I was allowed to spend a significant amount of time with angels who were to demonstrate this to me visually. By means of wonderful circular movements, impossible to describe, they formed a resemblance of the heart and a resemblance of the lungs, including all the intricate interior and exterior parts which the heart and lungs possess. They traced the spontaneous flow of heaven, for heaven strives to exhibit that form from the influx into itself of love from the Lord. In this manner each individual part of the heart was exhibited, and after that the union of the heart and the lungs, which union they also represented by means of the marriage of good and truth. From this also it was evident that the heart corresponds to the celestial element of good and the lungs to the spiritual element of truth, and that the material form in which the two exist joined together is the heart and lungs. I was also told that the same applies throughout the whole body, that is, to things of the heart and those of the lungs within all the individual members, organs, and viscera of the body. For where the two are not acting together but each one by turns separately, no motion of life belonging in any way in the will can exist there nor any feeling of life beginning in any way in the understanding there.