To know is to understand, not necessarily  
One can know and have no understanding 
While one can understand and not know much at all
Some things I know I just don't understand
While  some things I understand and have no idea why or how
Wisdom is the key, its byproduct is understanding and comes by way of knowledge
Who wants to be sincere but sincerely wrong
I believe no one takes this approach and is as common sense is not common

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