In Luke 10:19, Jesus said, "Behold, I give you the authority to trample on serpents and scorpions, and over all the power of the enemy, and nothing shall by any means hurt you."
The word 'authority' here is 'exousia' in Greek, and it can mean 'power to act, authority to act'; from the word 'exesti', which means 'permission (legal right) to do something'.
Therefore, people of God, whatever work of darkness, word of darkness, charm, witchcraft, black magic, or any unwholesome words that come against you, fear not! Because Jesus has given you His power and authority to trample on all these!
In fact, Jesus has given you the permission (legal right in the spiritual realm) to use His name! You can therefore exert this authority in His name, which is the name above all names - that every knee should bow, and every tongue should confess, that Jesus Christ is the Lord - in heaven, on earth, and under the earth! (Philippians 2:10-11)
What does 'serpents and scorpions' signify here? These signify 'anything or anyone that seek to harm you'. So right now, in the precious name of Jesus, you can hold the blood of Jesus against all those work of darkness that try to suppress you, oppress you, or even penetrate you. Amen!
Let's go back to two verses before Luke 10:19. Here's what the Scripture says in Luke 10:17-18, 'Then the seventy (disciples) returned with joy, saying, "Lord, even the demons are subject to us in Your name." And Jesus said to them, "I saw Satan fall like lightning from heaven."'
You know what this means? You have the superior power of God over Satan and all his powers on earth! Because Satan has fallen, and because you can use the name of Jesus, just like the disciples that returned with joy, you too have this privilege and authority that has been given to you!
Jesus Christ is the same yesterday, today, and forever! The same Jesus those days is the same Jesus who lives in you today! And therefore if you are in Christ, there's nothing in this world that you should be afraid of. In fact, they should be afraid of you!
Therefore, rejoice and be glad, because Jesus has given you this 'exousia', just as He has spoken in the Word, and because Jesus who is in you is greater than he that is in the world! (1 John 4:4)
Hallelujah!