What do you mean when you say that saints will eat themselves when they are tempted?

The meaning of this sentence is that when the sage moved his heart, he was bitten by ten thousand kinds of legal insects.

In many cultures, saints are regarded as sacred and inviolable, and hearts and emotions are regarded as pure and sacred. When a saint moves her heart, it means that she has violated her sacred duty and will be severely punished. This punishment is usually described as being bitten by a monster, which is regarded as a symbol of evil and destruction in many cultures.

This sentence can also be interpreted as that a person who violates his own moral standards or beliefs will be tortured and punished by his heart. This inner punishment may be more painful and far-reaching than any external punishment.