From the very beginning it was God's plan that man rule over the earth and everything in it. In Genesis 1:28 God said subdue the earth and have dominion. And how was man to rule, by his words. Man was to follow God's example and rule by his words like God ruled by his words. Their authority was in their connection with God. But, they(Adam & Eve) allowed the devil to talk them out of their authority. From that moment satan became the father of mankind instead of God and by that things came into the earth that God never intended(things of the devil). Because they obeyed man became subject to the things of the devil.Now fast forward to Jesus(the last Adam), He was a sinless man which means He was never subject to the devil. Jesus had the original authority that God gave man back in Genesis 1. And just as the first Adam was clothed in glory and honor Jesus was clothed with the anointing of the Holy Spirit. And with authority and the anointing He took authority over the works of the devil. And how did He take authority over the things of the devil, with his words. He was the son of God in the flesh. And He was to restore man to his rightful position of authority (Mark 13:34). And that's what He did through his death, burial, and ressurrection. God raised Jesus up and sat him at his own right hand with all things under his feet, Jesus is the head and we are the body of Christ (Ephesians 1:20-23). And when God raised Jesus up to his right hand, He also raised us up together with him (Ephesians 2:6) with all things under our feet(authority). So God's original plan was back in effect.Jesus put you in a position of authority to rule over the works of the devil. The scripture says Jesus has made us kings and priests, that's power and authority. In Ecclesiates 8:4 it says "Where the word of the king is there is power." You are seated at the right hand of the Father in Christ as far as your authority goes and when you open your mouth and speak in the name of Jesus there's power in your words. And not just power is in your words, but authority because as a priest Deuteronomy 21:5 says at the word of the priest shall every controversy and every assault be settled. You have God and his words and the devil and his words, whose words will you establish with your mouth. It's by your words, you have the say so. The devil no longer has rule over you, Jesus took care of that. So, fulfill God's plan and walk in your authority.