'To howl' signifies grief caused by vastation.

In Ezekiel 32:18, this signifies grief on account of their damnation. (Apocalypse Explained 659[4])

In Micah 1:8, this signifies the grief of the angels and of the men of the church. (Apocalypse Explained 695[24])

In Matthew 13:42, this signifies the grief of sensuous men in their opposition to truths. (Apocalypse Revealed 435)

In Revelation 18:9, this signifies people in control in the church mourning from embarrassment at the loss of wealth. (Apocalypse Revealed 467)

(Referenties: Apocalypse Explained 406)

6375. 'He binds his young ass to the vine' means truth in the natural for the external Church. This is clear from the meaning of 'binding' as being joined to; from the meaning of 'the vine' as the spiritual Church, dealt with in 1069, 5113, here the external spiritual Church since the description 'the outstanding vine' immediately after means the internal church; and from the meaning of 'an ass' as truth in the natural, dealt with in 2781. From this it is evident that 'he binds his ass to the vine' means a joining through truth in the natural to the external Church.