John 3:8-9 He who sins is of the devil, for the devil has sinned from the beginning. For this purpose the Son of God was manifested, that He might destroy the works of the devil.
When Jesus was on The Cross The last Words He Spoke was It is Finished At that very second we entered into The New Covenant Paid in Full by The Blood of Jesus. Jesus took the devil’s power and authority and then gave The Power and Authority over the devil and his works to The Believing Christians through The Name and Blood of Jesus. If only the church would accept this inheritance and set this world free to receive Jesus as their Lord and Healer. Sickness is a work of the devil. Jesus defeated the devil on the cross over all of His works, sickness, sins, death.
Colossians 1:9-18 For this reason we also, since the day we heard it, do not cease to pray for you, and to ask that you may be filled with the knowledge of His will in all wisdom and spiritual understanding; that you may walk worthy of the Lord, fully pleasing Him, being fruitful in every good work and increasing in the knowledge of God; strengthened with all might, according to His glorious power, for all patience and longsuffering with joy; giving thanks to the Father who has qualified us to be partakers of the inheritance of the saints in the light. He has delivered us from the power of darkness and conveyed us into the kingdom of the Son of His love, in whom we have redemption through His blood, the forgiveness of sins.
The greatest fear the devil and all of hell has is a Born Again Christian who knows his Inheritance and Power and Authority imparted to Him through The Name and Blood of Jesus. When a Born Again Believer knows his inheritance through The Name of Jesus He becomes the devil and demons biggest nightmare. When you use the name of and Blood of Jesus in Faith, the devil and demons see The Mighty Glory Power of Jesus and His Holy Angels not you.
Colossians 2:14-15 having wiped out the handwriting of requirements that was against us, which was contrary to us. And He has taken it out of the way, having nailed it to the cross. Having disarmed principalities and powers, He made a public spectacle of them, triumphing over them in it.
Mark 16:15-18 Go into all the world and preach the gospel to every creature.16 He who believes and is baptized will be saved; but he who does not believe will be condemned.17 And these signs will follow those who believe: In My name they will cast out demons; they will speak with new tongues; they will take up serpents; and if they drink anything deadly, it will by no means hurt them; they will lay hands on the sick, and they will recover.”
Hebrews 2:14-15 Inasmuch then as the children have partaken of flesh and blood, He Himself likewise shared in the same, that through death He might destroy him who had the power of death, that is, the devil, Inasmuch then as the children have partaken of flesh and blood, He Himself likewise shared in the same, that through death He might destroy him who had the power of death, that is, the devil, and release those who through fear of death were all their lifetime subject to bondage.