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.
There was the best teachers from the Czech Philharmonic highly dedicated people some of the best musicians in the world passing on the knowledge about the country about the principles and about the music.
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Now all the knowledge and wisdom that is in creatures whether angels or men is nothing else but a participation of that one eternal immutable and increased wisdom of God.