When a person begins teaching, they cease learning. Or rather, when they cease learning they begin to teach. When they have taken all they can comfortably take from knowledge, they seek the comforts of the teaching role - money, power, and respect. Now, all their time is spent trying to maintain appearances, playing the guru, and playing up to the expectations of their students. Now they have not the time nor the inclination to seek truth. On the contrary, now they are expected to know it, perish the thought of seeking it.
Now they pile up an armoury of words and categories with which to bludgeon the weak into submission, and to protect against the strong.
Their words have structure but no substance, while true words have substance but no structure. These false teachers are brittle and have many holes, but the true man is yielding yet impermeable. The false teachers cannot speak definitively. They mirror the needs of the weak, and have no words of their own. They only teach others how they have been taught themselves. They are no prophets, no messiahs. They do not have their own authority, and are not ready to be hated. Their teachings do not strike home to one's innermost being. Listening to them is like scratching at an itchy foot without taking off your shoe.
They have admirable words about the infinite, yet scorn the body. They strain out a gnat, while swallowing a camel. This is all because their teaching does not stem from enlightenment. It is shameful.
These false teachers are like rolling pins, that can reshape, but cannot create. But the true man is as hard and sharp as a knife. The false teachers speak of "the One" and "the many" as two aspects of Truth, though they only conceive of these one at a time, in isolation, not simultaneously. For them, each conception entails a different idea-tight mental compartment, and a different mental construction. This predictably results in an endless supply of ridiculous contradictions. They end up believing in an infinite soul that is separate from the body!