Demons
From Encyclopedia Reformata
Evil Spirits or Evil angels
Besides the good there are also evil angels, who delight in opposing God and destroying His work. They were created good, but did not retain their original position, 2 Pet. 2:4; Jude 6. Their special sin is not revealed, but they probably revolted against God and aspired to divine authority, cf. 2 Thess. 2:4, 9. Satan, who was evidently one of the princes among the angels, became the recognized head of those that fell away, Matt. 25:41; 9:34; Eph. 2:2. With superhuman power he and his hosts seek to destroy the work of God. They seek to blind and mislead even the elect, and encourage the sinner in his evil way.
Judo 6. “And the angels that kept not their principality, but left their proper habitation, He hath kept in everlasting bonds under darkness unto the judgment of the great day.”
Besides the good there are also evil angels, who delight in opposing God and destroying His work. They were created good, but did not retain their original position, II Pet. 2:4; Jude 6. The special sin of these angels is not revealed, but probably consisted in this that they exalted themselves over against God and aspired to supreme authority. Satan, who was evidently one of the princes among the angels, became the recognized head of those that fell away, Matt. 25:41: 9:34; Eph. 2:2. He is represented as the onginator of sin,. Gen. 3:1; John 8:44; II Cor. 11:3; I John 3:8; Rev. 12:9; 20:2, 10. They also possess superhuman power, but employ this in cursing God, in battling against Him and His Anointed, and in destroying His work. They seek to blind and mislead even the elect, and encourage the sinner in his evil way.
Source: Based on Louis Berkhof’s Summary and Manual of Christian Doctrine.

