John 20:30 Jesus performed many other signs in the presence of his disciples, which are not recorded in this book.
John 14:12 Very truly I tell you, whoever believes in me will do the works I have been doing, and they will do even greater things than these, because I am going to the Father.
Primarily due to these two verses, some streams in the Church advocate supernatural manifestations and practices not found in Scripture—some of them quite unusual. Based on John 20:30 it is claimed that Jesus likely performed miraculous signs of a nature not found in written Scripture. And according to John 14:12, believers will do even greater miraculous works than Jesus. Since it is thought (perhaps incorrectly so) to be impossible to do miracles greater than those done by Jesus, this is taken to mean that believers will do miracles of a kind not performed by Jesus in Scripture.
But according to Jesus, the Holy Spirit will not teach us to do miraculous works which Jesus never performed in Scripture.
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. (KJV)
The Holy Spirit will rather teach us “all things” by reminding us of “all things” spoken by Jesus to his disciples in Scripture. Both instances of “all things” here in the Greek are the identical term pas.
Therefore “all things” to be revealed to us by the Holy Spirit must refer to and be limited to what Jesus spoke or said to his disciples as recorded in the Holy Scriptures. Therefore he will not speak on his own. And he will tell us of things yet to come (John 14:13).
In his first letter to the Corinthians, Paul issues a warning:
1 Corinthians 4:6 Now, brothers and sisters, I have applied these things to myself and Apollos for your benefit, so that you may learn from us the meaning of the saying, “Do not go beyond what is written.” Then you will not be puffed up in being a follower of one of us over against the other.
It can be risky to go beyond what is written, especially in the realm of the miraculous. Jesus issues us a solemn warning in Matthew 7.
Matthew 7:21 “Not everyone who says to me, ‘Lord, Lord,’ will enter the kingdom of heaven, but only the one who does the will of my Father who is in heaven. 22 Many will say to me on that day, ‘Lord, Lord, did we not prophesy in your name and in your name drive out demons and in your name perform many miracles?’ 23 Then I will tell them plainly, ‘I never knew you. Away from me, you evildoers!’
It might not be worth going beyond Scripture simply for the sake of experiencing “new” supernatural dimensions—as if seeking out new fads to draw jaded believers to one’s ministry. We can minister fruitfully in miraculous signs and wonders during these Last Days to fulfill the Great Commission to the unreached simply by closely following written Scripture.