[We spend an exuberant amount of time "looking (seeing)" outside ourselves for all the solutions to all our troubles when in reality, as spoken here in the tao-te-ching/I Ching, etc., all our troubles and problems are from within us and all the answers to all these problems come from within us; provided we are ready, willing and able to "listen (hear)" that which is in our hearts. True intelligence, in this interpretation, is one who realizes and accepts that all things of the Universe experienced by the individual is a direct result of that individuals interaction with the Universe and all the differing "ways" that arise from this can be maneuvered into the correct path by that same individual who listens and hears; perceives and sees what is within, the Tao influences the within and provides us all the answers we could possibly seek in our life times.
Americans in particular seem to be drawn toward the type of strength that results in some dominance of others. This is a result of not having the ability to see or hear our hearts from within so we understand that the most difficult opponent we could ever encounter is us, the person within each of us. This is why it is coupled together here in this quote because they are intertwined. They are the two sides of the coin called "man or humans."
Man/humans can only understand the minds of all humans by first understanding their own mind. There is no other way and karate-do, like many differing ways, provides us the fundamental tools to achieve this wholehearted way of the human (persons) heart.]