The phrase, “moderation in all things” is a euphemism usually (but not exclusively) associated (by Mormons at least)with the Word of Wisdom. It usually means that we should not go too far, one way or the other, in abstaining to the point of becoming an ascetic or in indulging to the point of becoming an addict. Of course, that leaves lots of room for interpretation and individual opinion, as well as plenty of opportunity for members to judge one another uncharitably.