512. And the third part of the sea became blood, signifies that in consequence everything therein became the falsity of evil. This is evident from the signification of the "third part," as being all (See above, n. 506); also from the signification of the "sea," as being the natural man (See just above, n. 511); therefore "the third part of the sea" signifies the whole natural man and everything therein; also from the signification of "blood," as being falsity of evil (See also above, n. 329). From this the spiritual sense of this verse can be seen, namely, that "the great mountain burning with fire was cast into the sea, and the third part of the sea became blood," signifies that the love of self, when it enters into and occupies the natural man, turns every knowledge [scientificum] into the falsity of evil.

[2] The love of self is a love purely corporeal, springing from the rising up and fermenting of worn out parts and the titillation caused by these inwardly in the body; in consequence of which the perceptive faculty of the mind, which requires a pure atmosphere, not only becomes dull and gross, but even perishes. That this is the origin of the love of self can be seen from its correspondence with human dung; for those who have been corroded by this love, when they come into the other life love above all things stercoraceous filth, and its stench is grateful to them, which proves that the effluvium therefrom pleasantly affects the sensory of their smell, as it had before affected the general sensory, which is extended by interior cuticles in every direction. From this alone it can be seen that the love of self is more gross and foully corporeal than any other love, and consequently that it takes away all spiritual perception, which is a perception of the truth and good of heaven and the church. Moreover, it shuts up the spiritual mind and fixes its seat entirely in the natural and sensual man, which communicates most closely with the body and has no communication with heaven. From this again it comes to pass that all those in whom the love of self is dominant are sensual, and do not see the things that belong to heaven and the church except in the densest darkness; and furthermore they reject and deny these whenever they are alone and are thinking with themselves. From this the signification of "the third part of the sea became blood, in consequence of the great mountain burning with fire that was cast into it," can now be seen.

6125. 'In exchange for horses' means factual knowledge supplied from the understanding. This is clear from the meaning of 'horses' as ideas forming the understanding, dealt with in 2760-2762, 3217, 5321; and since they are spoken of in connection with Egypt, which means factual knowledge, 'horses' here are factual knowledge supplied from the understanding. But what factual knowledge supplied from the understanding is must be stated. There is an understanding part and there is a will part in the human mind, and these are situated not only in his internal man but also in his external. The human understanding is developing and growing from early childhood through to manhood, and it consists in a discernment of things gained from experience and formal knowledge, also a discernment of causes from effects as well as of consequences from a chain of causes. Thus the understanding part consists in a comprehension and perception of such things as are part of everyday life, public and private. An inflowing of light from heaven brings it into existence, and for that reason everyone's understanding is capable of being made more perfect. Understanding is given to everyone in accordance with his effort to make use of what he knows, in accordance with the life he leads, and in accordance with his individual character; no one lacks it provided he is of sound mind. A person is given it to the end that he may have freedom of choice, that is, have the freedom to choose good or evil. Unless he possesses an understanding like the one just described, he has no power of his own to make that choice; thus nothing could possibly be made his own.

[2] In addition to this it should be recognized that the understanding part of a person's mind is that which receives what is spiritual, so that it is the recipient of spiritual truth and good. For no good at all, that is, no charity, nor any truth at all, that is, any faith, can be instilled into anyone if he does not have that understanding part; but they are instilled in the measure that he does have it. This also explains why a person is not regenerated by the Lord until adult life when he does possess an understanding. Till then the good of love and the truth of faith fall like seed into utterly infertile soil. But once a person has been regenerated his understanding serves the function of enabling him to see and perceive what good is and from this what truth is. For the understanding converts things belonging to the superior light of heaven into those belonging to the inferior light of the natural world, as a consequence of which the former are then seen within the latter in the same way as a person's inner affections are seen in his face when it lacks all pretence. And because the understanding serves that function, many places in the Word where the spiritual side of the Church is referred to refer also to its power of understanding, a matter which will in the Lord's Divine mercy be dealt with elsewhere.

[3] From all this one may now see what is meant by factual knowledge supplied from the understanding, namely known facts which lend support to the things a person grasps and perceives with his understanding, whether those things are bad or good. Such facts are what are meant in the Word by 'horses from Egypt', as in Isaiah,

Woe to those who go down into Egypt for help, and rely on horses and trust in chariots because they are many, and on horsemen because they are extremely strong, but do not look to the Holy One of Israel and do not seek Jehovah. For Egypt is man (homo), not God; and his horses are flesh, not spirit. Isaiah 31:1, 3.

'Horses from Egypt' stands for factual knowledge supplied from a perverted understanding.

[4] In Ezekiel,

He rebelled against him by sending his ambassadors to Egypt, that ha might give him horses and many people. Will he prosper? Will he who does this be rescued? Ezekiel 17:15.

'Horses from Egypt' again stands for factual knowledge supplied from a perverted understanding, which knowledge is resorted to in matters of faith, though there is no belief in the Word, that is, in the Lord, apart from what that knowledge provides. Thus no belief ever comes to exist, for within a perverted understanding a negative attitude reigns.

[5] The destruction which such factual knowledge underwent is represented by the drowning of Pharaoh's horses and chariots in the Sea Suph; and since that knowledge is meant by 'horses' and false matters of doctrine by 'chariots', his horses and chariots are mentioned so many times in the description of that event, see Exodus 14:17-18, 27, 26, 28. And the Song of Moses and Miriam consequently contains these words,

Pharaoh's horse went, also his chariot, also his horsemen, into the sea; but Jehovah made the waters of the sea come back over them. Sing to Jehovah, for He has highly exalted Himself; He has thrown the horse and its rider into the sea. Exodus 15:19, 21.

[6] Similar factual knowledge is also meant by the things required before-hand for a king over Israel, in Moses,

If they desire a king, from among their brothers shall a king be set over them. Only let him not multiply horses for himself nor lead the people back into Egypt in order to multiply horses. Deuteronomy 17:15-16.

'A king' represented the Lord as regards Divine Truth, 1672, 1728, 2015, 2069, 3009, 3670, 4575, 4581, 4789, 4966, 5044, 5068, thus as regards intelligence since this comes, when it is genuine, from Divine Truth. The need for intelligence to be acquired through the Word, which is Divine Truth, and not through factual knowledge taken from one's own understanding is meant by the injunction that the king should not multiply horses or lead the people back into Egypt in order to multiply horses.