The inspired scriptures are for the purpose of instructing God's born again children how he wants them to live their lives, as they sojourn here on earth. There will be no purpose for them to be in heaven. There will be singing in heaven, but there will not be any preaching, or praying.
I'm stunned to hear you say that there will be no purpose for the scripture in heaven. If that were true, I don't see the Lord making them eternal. The scriptures, both the OT and the NT, the faithful are all that will cross over from this world to the next. So, when we get to heaven, will the Lord force each of us to love one another as he does, no matter what we were like before we died or were raptured? Otherwise, we'll need to be able to grow because I doubt that even one single person loves others as the Lord does.
We are told in scripture, no more shall any man say unto his brother or say to his neighbor, know the Lord, for they shall know me from the least of them unto the greatest of them. So, I can see the no preaching statement, but yikes at no prayer.
If heaven will only be idyllic bliss without challenge, then why are the leaves on the tree of life for the healing of nations?
The truth is; eye hasn't seen, ear hasn't heard, neither has it entered into the heart of man, those things that God has prepared.