釋鑑稽古略續集 3.108

3.108

制龍　徐有貞築一決口。下木石若無。往山中叩一道術之僧問之。僧曰。聖人無欲貞悟。下有龍穴性多欲。鎔鐵沈之龍徙去決口塞。

Subduing the Dragon: Xu Youzhen was building a breached embankment, but the timber and stone thrown into it were as if swallowed into nothing. He went into the mountains to consult a monk possessing Daoist arts. The monk said: "A sage has no desires and is purely enlightened; below lies a dragon's lair, and its nature has many desires. Melt iron and sink it therein; the dragon will move away and the breach will be closed."