One never actually learns anything passively.
Books, exhibits, teachers, provide a framework for the doing of, the application of, the learning.
Until you've done it, there is no way to know about all the random variables involved, and no way to effectively teach this. Living is knowing. But this knowing has very little to do with book-knowing.
Maybe you can quote taoteching to people, word for word, as many do, but until those words have actually changed your life, what do you know about it? Does knowing the words mean you are wise? No.
Furthermore, when you spend large amounts of energy keeping-the-city-out, you are less receptive to the fullness of life, than if you were not. Enlightenment means the total receptivity to all there is, and if you do that in a city, you end up insane. Even if you entered the city in a state of enlightenment, it would soon be lost, due to the nature of life in the city. Full awareness is dependent upon peace and quiet. Which is what a soul discovers when its body dies.