說無垢稱經疏 5.304

5.304

贊曰：此無緣慈，後四句也。真畢竟住，故修無壞，無壞時故。舊云「畢竟盡故」，畢竟盡諸煩惱，故體不壞。能緣意樂猶如金剛，故所觀如堅固難破，所修之慈名堅固慈。真性本淨，故修清淨。真等虛空，故修平等。

Commentary: These are the latter four clauses of objectless maitrī. Tathatā abides definitively, hence one cultivates indestructibility, because there is no time of destruction. The older version said, “because it is definitively exhausted”; definitively exhausting all afflictions, its substance is indestructible. The cognitive resolve is like a vajra, so the tathatā contemplated is firm and difficult to break; the maitrī cultivated is called firm maitrī. The nature of tathatā is fundamentally pure, hence one cultivates purity. Tathatā is equal to space, hence one cultivates impartiality.