In Ezekiel 26:11, this signifies the love of learning or intellectual things. (Arcana Coelestia 3727)

In Revelation 6:2, this signifies the love of understanding the Word. (Apocalypse Revealed 298)

In Zechariah 12:4, this signifies that the intellectual should be filled with falsities. (Arcana Coelestia 2383[2])

In general, 'a horse' signifies knowledge or understanding of the Word. In an opposite sense it signifies the understanding of the Word falsified by reasonings, and likewise destroyed from self-derived intelligence. 'A dead horse' signifies no understanding of truth from the Word.

1008. 'Requiring the soul of man' is avenging profanation. This is clear from what has been stated in the previous verse and in the present one, for the subject is the eating of blood, which means profanation. Few know what profanation is, still less what the penalty for it may be in the next life. Profanation takes many forms. A person who totally denies the truths of faith does not profane them any more than gentiles do who live outside of the Church and outside of all knowledge of them. That person profanes however who does know the truths of faith, and still more one who acknowledges them, bears them on his lips, proclaims them, and persuades others of the truth of them, while at the same time he leads a life of hatred, revenge, cruelty, robbery, and adultery, and confirms such behaviour in himself by many statements which he scrapes together from the Word. He profanes by perverting the truths of faith, and so immerses them in those foul deeds. This is the person who profanes, and these are the things that above all else spell death to a person. That they spell death becomes clear from the fact that in the next life unholy things are completely separated from holy, the unholy being in hell, and the holy in heaven. When this type of person enters the next life, every idea within his thought contains holy things clinging to unholy, as it was during his lifetime. There he is unable to produce one idea of what is holy without the unholy that clings to it being seen clear as daylight; for such perception of another person's ideas exists in the next life. So in every detail of his thinking profanation manifests itself, and because heaven has such a horror of profanation he is inevitably forced down into hell.

[2] The nature of ideas is hardly known to anyone. People imagine that there is nothing complex about them, when in fact every idea within thought contains countless elements variously linked together so as to produce a certain form and consequent picture image of the person, the whole of which is perceived and even seen with the eyes in the next life. Take this merely as an example: When the idea of a place comes to mind - whether of a region, or a city, or a house - the idea and an image of all the things the person has ever done in that place crop up at the same time, and spirits and angels see them all. Or, if the idea of somebody whom he has hated presents itself, the idea of all he has thought, said, and done against that person arises at the same time. The same applies to ideas of all things, but when these present themselves every single detail that he has conceived of and impressed upon himself regarding a particular matter becomes apparent. For instance, if he has been an adulterer, when the idea of marriage crops up, all the muck and filth of adultery, even of thought about it, does so too, likewise all the arguments used to confirm adulterous practices, whether based on the evidence of the senses, or on rational grounds, or on the Word. And the way in which he has adulterated and perverted the truths of the Word crops up too.

[3] Furthermore, the idea of one thing merges into the idea of the next and colours it just as a tiny quantity of black placed in water darkens the whole volume of water. Consequently a spirit is recognized by his ideas, and what is remarkable, each one of his ideas bears his own image or likeness. When such an idea is presented visually it is so ugly that it is horrible to look at. All this makes clear the nature of the state of people who profane holy things, and the image they present in the next life. But people who in simplicity have believed statements made in the Word can never be said to profane holy things, not even if they have believed statements which are not literally true; for what is said in the Word is expressed in accordance with appearances, about which see 589.