金剛經纂要刊定記 3.200

3.200

故知下。結義。三行一者，三義具足方成一行。謂空發心降伏，不修行亦非行。但發心修行，不降伏亦非行。空降伏修行，不發心亦非行。如鼎三足如天三光，闕一不可。譯經之妙厥在茲焉。

On "Therefore we know..." and so forth: concluding the meaning. "Three practices as one": only when the three meanings are complete does it constitute a single practice. If one merely generates the mind and subdues without cultivating practice, it is not practice. If one only generates the mind and cultivates practice without subduing, it is also not practice. If one merely subdues and cultivates practice without generating the mind, it is likewise not practice. Like the three legs of a cauldron, like the three luminaries of the sky, not one may be lacking. The marvel of the translation of the sūtra lies precisely herein.