瑜伽師地論略纂 11.163

11.163

又論言「於其涅槃修勝利想」者，謂此為誦，言常誦也。伽他為頌，鄔柁南為撮施。此言於涅槃修勝利想，即常誦也。

Furthermore, when the treatise states "cultivating the perception of the superior benefit in nirvāṇa", this refers to recitation, meaning constant recitation. Gāthā is verse; udāna is a concise declaration. Here, saying "cultivating the perception of the superior benefit in nirvāṇa" means constant recitation.