I love the above quote. It may take a little time to process its meaning but if you can–and, more important, if you can really takes it message to heart–you will have taken a big step down the path of unlearning.
To better understand, consider this story from Anthony de Mello:
When a man whose marriage was in trouble sought his advice, the Master said, "You must learn to listen to your wife."
The man took his advice to heart and returned after a month to say that he had learned to listen to every word his wife was saying.
Said the Master with a smile, "Now go home and listen to every word she isn't saying."
For another example, consider almost any news article you read. After you are done, examine the article for what wasn't said.
Searching for things that aren't there and listening to people for things they don't say, is difficult; but if you can develop these skills you will come to see the world more clearly. The evidence is all around us.