A lot of knowledge in any kind of an organization is what we call task knowledge. These are things that people who have been there a long time understand are important but they may not know how to talk about them. It's often called the culture of the organization.
Every job leaves its residue a bit of extra knowledge a new skill-set.
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The foundation of our religion is a basis of fact – the fact of the birth ministry miracles death resurrection by the Evangelists as having actually occurred within their own personal knowledge.