This part matters because the believer's authority is exercised "in the name of Jesus", and that phrase is easily misunderstood. In the ancient world, as in some churches today, a powerful name could be treated as a spell. The New Testament shows something very different.
What "in the name" means
When Peter healed the lame man at the temple gate, he said, "Silver and gold have I none; but such as I have give I thee: In the name of Jesus Christ of Nazareth rise up and walk" (Acts 3:6). When the crowd gathered, he explained how it had happened:
“And his name through faith in his name hath made this man strong, whom ye see and know: yea, the faith which is by him hath given him this perfect soundness in the presence of you all.” (Acts 3:16)
Peter is careful. It was "his name", but "through faith in his name". And even the faith was "by him". The name is not a sound with power in it. It stands for the Person, and it works through trust in the Person. To act "in the name" of Jesus is to act as His representative, on His authority, by His will, trusting Him for the result.
Jesus used the same phrase for prayer: "And whatsoever ye shall ask in my name, that will I do, that the Father may be glorified in the Son" (John 14:13), and "Whatsoever ye shall ask the Father in my name, he will give it you" (John 16:23). Prayer in Jesus' name is addressed to the Father, through the Son, for the Father's glory. The name is not a password tacked to the end of a request. It is the ground on which we come.
Paul and the spirit of divination
Acts gives one detailed example of an apostle commanding an evil spirit, and it repays close reading.
“And it came to pass, as we went to prayer, a certain damsel possessed with a spirit of divination met us, which brought her masters much gain by soothsaying: The same followed Paul and us, and cried, saying, These men are the servants of the most high God, which shew unto us the way of salvation. And this did she many days. But Paul, being grieved, turned and said to the spirit, I command thee in the name of Jesus Christ to come out of her. And he came out the same hour.” (Acts 16:16-18)
Several things are worth noticing.
Paul did not go looking for this spirit. The girl followed him, and he was on his way to prayer.
Paul did not act at once. "This did she many days." Authority does not require a believer to confront every manifestation the moment it appears.
What the spirit said was true. These men were servants of the most high God. But Paul did not want a demon's endorsement, just as Jesus had silenced the demons who called Him the Christ.
Paul did not converse with the spirit. He did not ask its name, its rank, or how it had entered. He spoke one sentence, to the spirit, in the name of Jesus Christ, and it left "the same hour".
And the result was not applause. The girl's masters dragged Paul and Silas to the magistrates, and they were beaten and jailed (Acts 16:19-24). Exercising authority over the enemy brought suffering, not comfort. That too is part of the pattern.
The sons of Sceva
Three chapters later, in Ephesus, Acts records the opposite case.
“Then certain of the vagabond Jews, exorcists, took upon them to call over them which had evil spirits the name of the LORD Jesus, saying, We adjure you by Jesus whom Paul preacheth. And there were seven sons of one Sceva, a Jew, and chief of the priests, which did so. And the evil spirit answered and said, Jesus I know, and Paul I know; but who are ye? And the man in whom the evil spirit was leaped on them, and overcame them, and prevailed against them, so that they fled out of that house naked and wounded. And this was known to all the Jews and Greeks also dwelling at Ephesus; and fear fell on them all, and the name of the Lord Jesus was magnified.” (Acts 19:13-17)
The seven sons had the right words. They even had the right name. What they did not have was a relationship with the One whose name they used. They treated "Jesus whom Paul preacheth" as one more powerful name in their stock of spells. The result was a humiliation so public that it brought fear on the whole city, "and the name of the Lord Jesus was magnified".
This is the plainest lesson in the New Testament about the difference between authority and magic. Magic says: say the right words and the power must work. Authority says: you belong to Christ, and He acts through you. The name of Jesus is not a key anyone can turn.
"Not by incantations"
The early church understood this. In the middle of the second century Justin Martyr, writing to the Roman Senate, appealed to what anyone could see in the city:
For numberless demoniacs throughout the whole world, and in your city, many of our Christian men exorcising them in the name of Jesus Christ, who was crucified under Pontius Pilate, have healed and do heal, rendering helpless and driving the possessing devils out of the men, though they could not be cured by all the other exorcists, and those who used incantations and drugs.12
Notice how Justin names the Lord: "Jesus Christ, who was crucified under Pontius Pilate". The name was not a magic word. It was the name of a real Man who had died and risen in history, and it was spoken by people who believed in Him.
A century later Origen, answering the pagan critic Celsus, who accused Christians of using sorcery, drew the line even more sharply:
For it is not by incantations that Christians seem to prevail (over evil spirits), but by the name of Jesus, accompanied by the announcement of the narratives which relate to Him; for the repetition of these has frequently been the means of driving demons out of men, especially when those who repeated them did so in a sound and genuinely believing spirit.13
"Not by incantations … but by the name of Jesus, accompanied by the announcement of the narratives which relate to Him." In other words, the early Christians drove out demons by naming Christ and telling His story: His birth, His death, His resurrection. The gospel itself was the weapon. (Origen goes on to say that the name had sometimes worked even when spoken by bad men, and cites Matthew 7:22. That only confirms the point of Part 2: success in deliverance is not a certificate of salvation.)
Jesus and the name of Legion
Someone may point out that Jesus once asked a demon its name. In the country of the Gadarenes, He asked the man possessed, "What is thy name? And he answered, saying, My name is Legion: for we are many" (Mark 5:9). Is this a pattern for believers to interview demons, to learn their names, ranks and rights?
The answer is no, for three reasons. First, this is a single question in a single account, and it is never repeated by the apostles; in Acts they command, they do not question. Second, Jesus is the Lord of the spirits in a way no believer is. What He chose to do in His own authority is not automatically a method for us; He also walked on water. Third, the rest of the Gospels show Jesus silencing demons, not drawing them out. The overwhelming pattern is "Hold thy peace, and come out of him" (Mark 1:25).
The Lausanne report on spiritual conflict made a related point about the modern stress on discovering the names of spirits. It warned that "The emphasis on discerning and naming demons before we can have power over them is approaching a form of Christian animism or Christian magic. The idea of needing the names to have power over spirits is found in magical thinking around the world."14
So this paper does not teach conversation with demons. Not to gather information, not to learn names, not to negotiate. Jesus did not take their testimony, Paul did not ask their names, and the devil is "a liar, and the father of it" (John 8:44). Nothing a demon says is worth hearing.
Angels are sent, not summoned
A second area where "authority" has been stretched is the teaching that believers can command angels: dispatch them, assign them, "loose" them on errands. Scripture does teach that angels serve God's people: "Are they not all ministering spirits, sent forth to minister for them who shall be heirs of salvation?" (Hebrews 1:14). And it gives us vivid pictures of their protection: "The angel of the LORD encampeth round about them that fear him, and delivereth them" (Psalm 34:7).
But notice the verb in Hebrews 1:14: angels are "sent forth". By whom? Not by us. When Elisha's servant was terrified by the Syrian army, Elisha did not command the angelic host. He prayed to God: "LORD, I pray thee, open his eyes, that he may see. And the LORD opened the eyes of the young man; and he saw: and, behold, the mountain was full of horses and chariots of fire round about Elisha" (2 Kings 6:17). When Jesus Himself was arrested, He said, "Thinkest thou that I cannot now pray to my Father, and he shall presently give me more than twelve legions of angels?" (Matthew 26:53). Even the Son spoke of praying to the Father for angels.
And Scripture forbids the opposite error, of making angels objects of devotion. Paul warns against "worshipping of angels" (Colossians 2:18). When John fell at an angel's feet, the angel said, "See thou do it not: for I am thy fellowservant, and of thy brethren the prophets, and of them which keep the sayings of this book: worship God" (Revelation 22:9).
So this paper does not teach commanding, summoning or praying to angels. We pray to the Father in the name of the Son, and He sends His servants as He wills.
Bless, and curse not
A third distortion is the idea that a believer's authority includes the power to curse: to "return" curses to the sender, to declare judgments on enemies, to send "fire" on those who oppose us. The New Testament could hardly be plainer.
“Bless them that curse you, and pray for them which despitefully use you.” (Luke 6:28)
“Bless them which persecute you: bless, and curse not.” (Romans 12:14)
When James and John wanted to call down fire on a Samaritan village, Jesus "turned, and rebuked them, and said, Ye know not what manner of spirit ye are of" (Luke 9:55). There is no "sevenfold return" of curses in the teaching of Christ. The believer's authority is over the devil, not over other people, and its spirit is the spirit of the cross.
Nor does a believer need to fear curses spoken against him. "As the bird by wandering, as the swallow by flying, so the curse causeless shall not come" (Proverbs 26:2). And above all, "Christ hath redeemed us from the curse of the law, being made a curse for us" (Galatians 3:13). The one who is in Christ is under blessing, not under any man's curse.