J. I. Packer said: "We have much more to learn, but God has no more to reveal than he has revealed in Jesus Christ." The Book of Hebrews tells us that God has revealed himself through his son. We are done. We need no more.
There are those who always want to add more, however. There are the Mormons with their “another testament”. There are the Bible Codes guys with their secret messages and decoder rings. There are the Pentecostal preachers who get new revelations from God, even if they contradict the scripture. There are New Agers who get messages from God and publish books about them.
We don’t need them.
Any of them.