Humility
When someone wants to view the reality of your soul, show it with humility. Because the reality is... our souls are all a little dirty. And we haven't been the best versions we could be. So make sure when you show all of yourself you do so with some humility.
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As humility washes over you, you feel a shaking in your shins (しん). Humility lives in your shins, so now they're shaking and trying to bring you down to the ground.