And I saw another angel ascending from the east, having the seal of the living God: and he cried with a loud voice to the four angels, to whom it was given to hurt the earth and the sea,
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Bede
AD 735
east: The Lord incarnate, Who is the Angel of the great counsel, that is, the Messenger of His Father's will, has visited us, "the day-spring from on high," bearing the ensign of the cross, with which to seal His own in their foreheads.
Having the seal. This sign is generally supposed to be the sign of the cross. In the East, it was the custom to impress some indelible mark upon the soldiers. This sign amongst the ancient Christians was used on every occasion. (Calmet)
He speaks of Elias the prophet, who is the precursor of the times of Antichrist, for the restoration and establishment of the churches from the great and intolerable persecution. We read that these things are predicted in the opening of the Old and New Testament; for He says by Malachi: Lo, I will send to you Elias the Tishbite, to turn the hearts of the fathers to the children, according to the time of calling, to recall the Jews to the faith of the people that succeed them. And to that end He shows, as we have said, that the number of those that shall believe, of the Jews and of the nations, is a great multitude which no man was able to number. Moreover, we read in the Gospel that the prayers of the Church are sent from heaven by an angel, and that they are received against wrath, and that the kingdom of Antichrist is cast out and extinguished by holy angels; for He says: Pray that you enter not into temptation: for there shall be a great affliction, such as has not been from the beg...