The Buddhist door is a pure ground. Even if the ground is pure, why does it need to be swept? Even if it is an empty door, there is no door to close.

If a pure land is not swept frequently, it will not become a pure land. Once the empty door is closed, it is not the outsiders that are locked in, it is just the worldly world outside. In fact, the empty gate of pure land is originally nothingness. The world of mortals is nothing but floating dust, life is nothing but impermanence, and love is nothing but gathering and separation.

If there is nothing in our hearts, then where can we stir up dust?