Firstly, that kan allows us to access things that Essence alone cannot touch—things that are not physical—specifically, he mentions thoughts and time as instances of that. And secondly, kan allows us to use Essence with a level of finesse and efficiency that is not possible otherwise. He gives the example of drinking from a pool. Manipulating Essence by itself is like scooping the water with your hands, whereas using kan to do it is more like using a cup.”
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