In the Book of Jude, verse 9, there's something very instructive for our learning. It says, "Yet Michael the Archangel, when contending with the devil he disputed about the body of Moses, durst not bring against him a railing accusation, but said, The Lord rebuke thee." This was after Moses died. Michael, the Archangel, came to take his body.
However, when he got there, the devil also wanted Moses' body, because he had a right over everyone who died in this world, until Jesus came.
Satan had adamic authority, which he got from Adam in the Garden of Eden; thus, he was higher than Michael at the time. So, what did Michael do? He said, "The Lord rebuke thee." He had to speak to Satan in the Name of the Lord, to be able to get the body of Moses. Now, in Matthew 16:19, Jesus said, "And I will give unto thee the keys of the kingdom of heaven: and whatsoever thou shalt bind on earth shall be bound in heaven: and whatsoever thou shalt loose on earth shall be loosed in heaven." This is a present-hour truth! Satan has been stripped of all power.
Jesus said, "...I beheld Satan as lightning fall from heaven" (Luke 10:18). Then in Luke 10:19, He said, "Behold, I give unto you power to tread on serpents and scorpions, and over all the power of the enemy: and nothing shall by any means hurt you." We have authority over Satan and the cohorts of darkness. They've all been thoroughly and totally defeated, and we're charged to execute judgment against them: "To execute upon them the judgment written: this honour have all his saints. Praise ye the LORD" (Psalm 149:9).
Satan has lost his right to this world! You never have to fight or struggle with him! When he shows up, or you perceive that he's stirring trouble around you, cast him out! James 4:7 says, "...Resist the devil, and he will flee from you." How do you resist him? It's with the Word. When you speak the Word, Satan bows: "And take the helmet of salvation, and the sword of the Spirit, which is the word of God" (Ephesians 6:17).