Evil angels we read of, Psalms 78:49. And we read of "angels which kept not their first estate, but left their own habitation, that the Lord hath reserved in everlasting chains, under darkness, unto the judgment of the great day. (Jude 1:6) And we read that Satan is sometimes - transformed into an angel of light." (2 Corinthians 11:14) But the Scriptures are altogether silent respecting their nature, agency, and extent. The Holy Ghost hath been graciously pleased to give general precepts and warnings to the church, respecting the malignity of those evil angels, and to admonish the people of God to resist the devil, and that he shall flee from them. We are taught also, by the several names given to the chief of those evil powers, to be always looking to the Lord Jesus for grace to resist the "fiery darts of this enemy," who is called, "the prince of this world." (John 12:31) "the prince of the power of the air; the spirit that now worketh in the children of disobedience," (Ephesians 2:2) But to numberless enquiries, which we feel highly disposed to put forth, concerning these things, there are no encouragements of any answers to be given in the word of God. It is very blessed, however, to be enabled by the promises of God, to take to ourselves those glorious and comprehensive assurances which belong to the whole church of Christ, and which ensure the present safety of every individual member, and the ultimate triumph in Christ, over Satan and all his angels. One Scripture tells the church, that"no temptation hath them taken, but such as is common to man: and that God is faithful, who will not suffer them to be tempted above that they are able; but will with the temptation also make a way to escape, that they may be able to bear it." (1 Corinthians 10:13) And another Scripture saith, that "the God of peace shall bruise Satan under their feet shortly." (Romans 16:20) Here then, is enough for every child of God to know and to rest in, until the whole comes to be explained in eternity.
See Satan