From a functional point of view, the specific methods are substitutable. The pain caused by someone else's hand slapping and one's own use of the needle point is a pain, and it is good to punish oneself in some form to achieve the effect of purification.
If you do it yourself, although you do not ask for anything, you often fall into the infinite evil; if others contribute, your burden will be lighter; if someone is willing to sacrifice for your purification, this is the advanced stage.
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