This is a very true quote. Without teaching & hearing to others doubts we can't elaborate our knowledge. In my experience I found it when I taught my children. Unexpected questions come from them to our great surprise. Some of them, when we are unable to answer, then only we realize that we are not that much knowledgeable person.
Our ancestors kept most of their knowledge in secret, sad even their bloodlines don't know about them. Various inventions have perished, unknown to us in this way!
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