What do the breastplates symbolize? (Revelation 9:17)
And thus I saw the horses in the vision, and them that sat on them, having breastplates of fire, and of jacinth, and brimstone: and the heads of the horses were as the heads of lions; and out of their mouths issued fire and smoke and brimstone.
Revelation - King James
⚪ The doctrine of hell-fire
Rev. 9:17 [...]
And them taht sat [on] UPON them. - The total Protestant church membership.
Having breastplate of fire - Keeping the doctrine of hell-fire well to the front in their teachings.
And of jacinth. - "The hyacinthus of the Romans is invariably blue and lustrous. This description suggests the blue flame which issues between the fire and the brimstone, represented as 'smoke' in verse 18." - Cook.
And brimstone. - Yes, indeed, plenty of brimstone went along with the hell-fire. - Rev. 14:10.
Source : 🇺🇸 1917 - Studies in the Scriptures, Vol 7, The finished mystery, page 164 + Cover
⚫ The fiery zeal for Jehovah
The vision discloses that the horses and riders have breastplates of fire, jacinth, and brimstone, and the horses had heads like lions, and out of their mouths issued fire and brimstone. (Vs, 17) Such a fiery, sulphurous breastplate would be a terrifying sight for the enemy to behold. In symbolic language the Lord says: "The day of vengeance is in mine heart." (Isa, 63:4) Such also is the heart attitude of the Lord's army, pictured by the fiery breastplate, and that fiery zeal for Jehovah is pictured as covering the most vital organ, to wit, the heart, and it terrifies the enemy but speaks victory to God's anointed. - Phil. 1:28.
Source : 🇺🇸 1930 - Light, Vol 1, page 166 + Cover