Mark 16:15,17a,18b NKJV ... He (Jesus) said to them (His disciples), "Go into all the world and preach the Gospel to every creature. And these signs will follow those who believe. In My Name they will cast out demons; they will speak with new tongues; they will lay hands on the sick, and they will recover."
In this Scripture, Jesus not only commissioned His twelve disciples to go into all the world, preach the Gospel, heal the sick, and cast out demons in His Name, but also included in this commission every believer to come throughout all the ages. This is everyone who believes! This includes you and me!
We are always in spiritual warfare. We must do warfare to overcome ... to be victorious ... over evil. Since this is spiritual warfare ... not physical warfare ... we have to use spiritual weapons. We are living "in the flesh" (the physical), but our weapons and warfare are not of the human, natural kind. We must use God's mighty weapons which He gives to us for the over-throw, the pulling-down, and the destruction of evil strongholds.
The Name of Jesus Christ of Nazareth is such a weapon, but it works only when it's spoken forth from the believer's mouth in power and authority.
Reverend Robert W. & Mary C. Butler