Soul receives from soul that knowledge,
therefore not by book nor from tongue.
If knowledge of mysteries come after emptiness of mind,
that is illumination of heart.
I spent a long time understanding what he was trying to say through these lines. Perhaps , the sole reason why people connect for long , be friends and narrate their thoughts , casting people into their world and rating them into categories of close , closer and closest . Or this could be the reason you found me , existing , struggling , communicating , my thought about this quote, to you , whom I found likewise the same way .
Yes knowledge of mysteries comes form emptiness of mind , when its relaxed and assuming tranquility of its own kind and will pour out its own way , via heart , through worthy words .
People get from people , desire , love , peace , company , hatred , nostalgia and everything that keeps them busy for sometime . Till they fall back to silence to realize , who has been there and should be there . And prepare a list of people wanted and unwanted , and again repeat the process above .
only if your heart has been illuminated , you can realize what light is to this journey of life .