Verse in question. John 14:12 “Verily, verily, I say unto you, He that believeth on me, the works that I do shall he do also; and greater works than these shall he do; because I go unto my Father.”
In the first place, Jesus is God. 1 Timothy 3:16 “And without controversy great is the mystery of godliness: God was manifest in the flesh, justified in the Spirit, seen of angels, preached unto the Gentiles, believed on in the world, received up into glory.” Who came in the flesh? God. And this without controversy. He was God with us. Matthew 1:23 “Behold, a virgin shall be with child, and shall bring forth a son, and they shall call his name Emmanuel, which being interpreted is, God with us.” So while on earth, He was still God. This is why He was worshipped. He received worship of the wise men. “Saying, Where is he that is born King of the Jews? for we have seen his star in the east, and are come to worship him.And when they were come into the house, they saw the young child with Mary his mother, and fell down, and worshipped him: and when they had opened their treasures, they presented unto him gifts; gold, and frankincense, and myrrh.” Matthew 2:2, 11. Example of the blind man that was healed. John 9:35-38 “Jesus heard that they had cast him out; and when he had found him, he said unto him, Dost thou believe on the Son of God? He answered and said, Who is he, Lord, that I might believe on him? And Jesus said unto him, Thou hast both seen him, and it is he that talketh with thee. And he said, Lord, I believe. And he worshipped him,” The disciples recognized Him as such especially after the resurrection. John 20:28 “And Thomas answered and said unto him, My Lord and my God.” We recognize that the greatest is God and it is impossible to do greater than God.
Let’s go back to that verse and identify why they will do grater works than Christ? John 14:12 “Verily, verily, I say unto you, He that believeth on me, the works that I do shall he do also; and greater works than these shall he do; because I go unto my Father.” The reason is that Jesus will go back to the Father. What promise did Jesus give when He goes back to the Father? John 14:16 “And I will pray the Father, and he shall give you another Comforter, that he may abide with you for ever.” As Jesus was the Comforter when on earth to the disciples, the Father is going to send another Comforter when Jesus leaves. And Who is this Comforter? John 14:26 “But the Comforter, which is the Holy Ghost, whom the Father will send in my name, he shall teach you all things, and bring all things to your remembrance, whatsoever I have said unto you.” This is why we need to ask for the Holy Spirit. Luke 11:13 “If ye then, being evil, know how to give good gifts unto your children: how much more shall your heavenly Father give the Holy Spirit to them that ask him?” What did Jesus give us when He departed back to heaven? Ephesians 4:8 “Wherefore he saith, When he ascended up on high, he led captivity captive, and gave gifts unto men.” What are these gifts? 1 Corinthians 12:7-11 “But the manifestation of the Spirit is given to every man to profit withal. For to one is given by the Spirit the word of wisdom; to another the word of knowledge by the same Spirit; To another faith by the same Spirit; to another the gifts of healing by the same Spirit; To another the working of miracles; to another prophecy; to another discerning of spirits; to another divers kinds of tongues; to another the interpretation of tongues: But all these worketh that one and the selfsame Spirit, dividing to every man severally as he will.” In what capacity are these gifts given? 1 Corinthians 12:12-14 “For as the body is one, and hath many members, and all the members of that one body, being many, are one body: so also is Christ. For by one Spirit are we all baptized into one body, whether we be Jews or Gentiles, whether we be bond or free; and have been all made to drink into one Spirit. For the body is not one member, but many.” In this body He gives all these gifts to operate. 1 Corinthians 12:27-28 “Now ye are the body of Christ, and members in particular. And God hath set some in the church, first apostles, secondarily prophets, thirdly teachers, after that miracles, then gifts of healings, helps, governments, diversities of tongues.” What is this body? Colossians 1:18 “And he is the head of the body, the church: who is the beginning, the firstborn from the dead; that in all things he might have the preeminence.” So these gifts operate in the church of Christ here on earth. This is why it is so important to be a part of that one church.
Because Jesus went back to the Father and sent the Holy Spirit to His church, that church, as a church, will do greater works than Jesus while on earth. John 14:12-13 “Verily, verily, I say unto you, He that believeth on me, the works that I do shall he do also; and greater works than these shall he do; because I go unto my Father. And whatsoever ye shall ask in my name, that will I do, that the Father may be glorified in the Son.” And what is the result of these works? The Father and the Son are glorified not the individual who is doing those works. Matthew 5:16 “Let your light so shine before men, that they may see your good works, and glorify your Father which is in heaven.” The greatest works that can be seen is the conversion of a sinner from his ways to become a new creation in Christ Jesus. That is the most amazing. Surely that has been done by the church to a much greater degree through the Holy spirit in the Power of Jesus Christ than when Jesus walked the streets of old Jerusalem.