The angel stretched out his hand against Jerusalem to destroy it but Jehovah repented Him of the evil, and said to the angel that destroyed the people, It is enough, now stay thy hand.  And David saw the angel that smote the people (2 Samuel 24:16, 17);

besides other passages.  Because the angels have such power they are called powers; as in David: 

     Bless Jehovah, ye angels, mighty in power (Psalm 103:20).

230.  But it must be understood that the angels have no power whatever from themselves, but that all their power is from the Lord; and that they are powers only so far as they acknowledge this.  Whoever of them believes that he has power from himself instantly becomes so weak as not to be able to resist even a single evil spirit.  For this reason angels ascribe no merit whatever to themselves, and are averse to all praise and glory on account of any thing they do, ascribing all the praise and glory to the Lord.

231.  It is the Divine truth that goes forth from the Lord that has all power in the heavens, for the Lord in heaven is Divine truth united to Divine good (see n. 126-140).  To the extent that angels are receptions of this truth they are powers.{1} Moreover each one is his own truth and his own good because each one is such as his understanding and will are.  The understanding pertains to truth because everything of it is from truths, and the will pertains to good because everything of it is from goods; for whatever any one understands he calls truth, and whatever he wills he calls good.  From this it is that everyone is his own truth and his own good.{2} Therefore so far as an angel is truth from the Divine and good from the Divine he is a power, because to that extent the Lord is in him.  And as no one’s good and truth are wholly like or the same as another’s, since in heaven, as in the world, there is endless variety (n. 20), so the power of one angel is not like the power of another.  Those who constitute the arms in the Greatest Man, or heaven, have the greatest power because such are more in truths than others, and into their truths good flows from the entire heaven.  Moreover, the power of the whole man passes into the arms, and by means of these the whole body exercises its powers.  It is for this reason that in the Word “arms” and “hand” signify powers.{3} Sometimes on this account a naked arm is seen in heaven so powerful as to be able to break in pieces everything in its way, even though it were a great rock on the earth.  Once it was moved towards me, and I perceived that it was able to crush my bones to atoms.

{Footnote 1} Angels are called powers and are powers from their reception of Divine truth from the Lord (n. 9639).  Angels are recipients of Divine truth from the Lord and on this account are sometimes called “gods” in the Word (n. 4295, 4402, 7268, 7873, 8192, 8301, 9160).

{Footnote 2} A man or an angel is his