Subduction Zone
Veteran Member
I do not think that there is any such rule. If one says "I know" one must be ready to demonstrate how one knows. If one can't do that then it can be called proselytizing or preaching.I believe I have a long post for that. I am sure you will find my belief backed by evidence.
I always have to remind people that, when I say I believe it is due to RF rules that no-one can know anything. Even if I believe I have absolutely sure evidence I still have to say, I believe.