As much as everyone might laugh when I say this, I struggle with the urge to comment too much in church. (I know; I made up for it with my blogging.) I think the reason I struggle in church is two-fold:
1) There really is an incredibly wide range of understanding and maturity in any adult class at church. It is so hard to say something that everyone will understand and no one will misunderstand - and I don’t want to cause serious misunderstanding and/or offense. While that is true to a degree with blogging, there is a self-selection process that tends to weed out most of those who can’t handle dissenting opinions. Therefore, it’s much harder to surprise someone with something they have never considered previously and risk hurting their testimony.
2) Given my current calling and education, I am seen as one of the “experts” in our ward (and even more so in the tiny branch we attended recently). Therefore, when someone asks a question that results in silence, the teacher tends to ask me - which makes me hesitant to comment at other times. I still comment, but it makes me hesitate.
I also use the "importantly incorrect and/or dangerous doctrine rule". (When something is said that is so incorrect that it is dangerous, it needs to be corrected as quickly as possible.) If I think a comment fits that classification, I will comment every time - as gently as I can, but directly - and usually waiting to see if anyone else jumps in to comment first.
Finally, the truly ironic thing about my situation is that my callings give me an aura of “conservatism” or “authority” - even though many of my views would be challenged by some as “liberal” if it weren’t for my callings. I think that is sad, but I understand why it is so.