A man has no knowledge of that which he does not know. He is oblivious to what there is to be known when he has no knowledge of its existence. In other words, you don't know that you don't know, what you don't know.
Knowledge is gained slowly and is sharpened by age, experience and time. The learning of one more thing, no matter how small, allows us to expand beyond our previous horizons. We do not appreciate sight because we have never been blind. Neither do we appreciate knowledge or experience that we have never known or experienced. But then again, mankind appreciates little that requires effort of thought.
© R. G. Crosbie