And with that, your Zen training wheels come off. From here on out, emptiness is no longer a realization. Instead, it becomes a tool that you will use for the remainder of your training. After you answer the Mu koan, you will begin to work through any number of other koans. Zen calls this climbing the mountain of swords that is riddled with the skulls of the fallen. And it can be every bit as baddaunting as that description implies. Each koan forces you to confront some aspect of yourself - some fear, attachment, belief, etc. - that is keeping you from true enlightenment. But rather than working with these things intellectually as you might in therapy, you approach these karmic impediments from the experience of emptiness. The deeper you go into mu [emptiness], the better the insight you gain, and the more likely you are to unshackle yourself from these obstacles. The entirety of this practice is a dance between the world of form and the world of emptiness. You delve into emptiness in your sitting and you bring it back to the world of form in your probing of the koan you are working with.
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