大般涅槃經疏 17.10

17.10

「唯四無量心」下，第三明善本，為三。初為六度本、次為發心本、三自相本。

From 'Only the four immeasurable minds' onward, the third explains the root of goodness, having three parts: first, being the root of the six pāramitās; next, being the root of generating the aspiration [for awakening]; third, being the root of their own characteristics.