And I beheld, and heard an angel flying through midheaven, saying with a loud voice, Woe, woe, woe, to the inhabitants of the earth by reason of the other voices of the trumpet of the three angels, which are yet to sound!
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Victorinus of Pettau
AD 303
By the angel flying through the midst of heaven is signified the Holy Spirit bearing witness in two of the prophets that a great wrath of plagues was imminent. If by any means, even in the last times, any one should be willing to be converted, any one might even still be saved.