415. And I looked, and I heard an angel flying in the midst of heaven. (8:13) This symbolizes instruction and prediction from the Lord.

In the highest sense an angel means the Lord, and so also something from the Lord (no. 344). And to fly in the midst of heaven and speak means, symbolically, to perceive and understand, and when said of the Lord, to foresee and provide (no. 245). But here it means to instruct and predict.

2074. That 'will one be born to a son of a hundred years?' means that in that case the Rational belonging to the Lord's Human Essence would be united to the Divine Essence is clear from the meaning of 'a hundred', regarding which see above, in 1988.