The name of Jesus is the most powerful name in the universe. It is above every other name:
Far above all principality, and power, and might, and dominion, and EVERY name that is named, not only in this world, but also in that which is to come. (Ephesians 1:21)
And Jesus came and spake unto them, saying, All power is given unto me in Heaven and in earth. Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost; Teaching them to observe all things whatsoever I have commanded you: and lo, I am with you always, even unto the end of the world. (Matthew 28:18-20)
The Lord shall establish thee an holy people unto Himself, as He hath sworn unto thee, if thou shalt keep the commandments of the Lord thy God, and walk in His ways. And all people of the earth shall see that thou art called by the name of the Lord; and they shall be afraid of thee. (Deuteronomy 28:9-10)
Therefore thus saith the Lord of the men of Anathoth, that seek thy life, saying, Prophesy not in the name of the Lord, that thou die not by our hand; Therefore thus saith the Lord of hosts, Behold, I will punish them; the young men shall die by the sword; their sons and their daughters shall die by famine. (Jeremiah 11:21-22)
Evil men sought to kill Jeremiah because he prophesied in the name of the Lord and they knew his prophecy had God’s authority behind it.
We often fail in ministry because we depend on our own ability to deliver someone. It is not our name, position, or authority that carries the power. Our power is in the name of Jesus. We should remind ourselves and others daily that it is never about us nor any ‘good’ thing we may be doing. It is all because of the power and authority of God's spirit working within us.
And his name through faith in his name hath made this man strong, whom ye see and know: yea, the faith which is by him hath given him this perfect soundness in the presence of you all. (Acts 3:16)
So then faith comes by hearing, and hearing by the Word of God. (Romans 10:17)
It is so imperative that we know what the word of God says!
The greatest power in the name of Jesus is the power of salvation from sin. It is only through His name that salvation comes.
And she shall bring forth a son, and thou shalt call His name Jesus: for He shall save His people from their sins (Matthew 1:21)
He that believes on Him is not condemned; but he that believe not is condemned already, because he hath not believed in the name of the only begotten Son of God. (John 3:18)
Jesus said unto him, I am the way, the truth, and the life; no man comes unto the Father, but by me. (John 14:6)
That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised Him from the dead, thou shalt be saved. For with the heart man believes unto righteousness; and with the mouth confession is made unto salvation. (Romans 10:9-10)
But as many as received Him (Jesus), to them gave He power to become the sons of God, even to them that believe on His name. (John 1:12)
Not only are you cleansed from sin and justified through the name of Jesus, you are also sanctified. Sanctification comes through the power of God which continues to work in you after salvation to enable you to live a holy life. Apostle Paul speaks of the evils of sin. He says,
Know ye not that the unrighteous shall not inherit the kingdom of God? Be not deceived: neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor abusers of themselves with mankind, Nor thieves, nor covetous, nor drunkards, nor revilers, nor extortioners, shall inherit the kingdom of God.And such were some of you: but ye are washed, but ye are sanctified, but ye are justified IN THE NAME of the Lord Jesus, and by the Spirit of our God. (I Corinthians 6:11)
Previously, these Corinthians lived in these sinful practices. Now they could live a holy life through sanctification which came through the name of Jesus and the power of God's Holy Spirit.