There are a lot of “old sectarian notions” that Mormons accept without questioning or examining. The idea that we think we know it all, and therefore, there is no need to think more deeply about it, or query the mind and will of the Lord on the matter, it itself an “old sectarian notion”.
In fact, one of the defining characteristics of a sect is that they have notions substituting for true factual and revelatory insights.
John144 