There are many things that can be done in the Kingdom of God. There is evangelism, pastoring, teaching, and prophesying. There is the care of young converts, the care of the poor, etc. I want to suggest that all these things are good and necessary.
If someone deceived you that you would go to heaven, and on that day you realise that you cannot get into heaven, that person will have done you great harm. We want to teach something that we have not taught often because I consider it to be fundamental for a church of 6,000 members that will soon be here.