They taught us because they wanted to pass the knowledge on and educate young musicians. It was not because they had to teach because they failed as musicians. There is a huge difference in the reasons why someone is teaching and what they can offer and what they cannot offer.
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.