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.

9687. 'From violet and purple and twice-dyed scarlet and fine twined linen' means composed of the good of charity and faith. This is clear from the meaning of 'violet', 'purple', 'twice-dyed scarlet', and 'fine twined linen', where the veil, meaning the uniting intermediary between the inmost and middle heavens, is the subject. There these materials mean forms of the good of love and faith, dealt with in 9671; here however they mean forms of the good of charity and faith since the subject is the screen, by which the uniting intermediary between the second and lowest heavens is meant, 9686. For in the inmost heaven the good of love to the Lord is predominant, but in the middle heaven the good of charity towards the neighbour, and in the lowest heaven the good of faith. So it is that 'violet', 'purple', 'twice-dyed scarlet', and 'fine twined linen' mean the forms of good predominant in those heavens.