無量壽經連義述文贊 2.163

2.163

經曰「勇猛精進」至「惠利群生」者，述云：第二、修言。有三：此初、無間修也。勇猛精進者，即初精進。誓不怯敵，故云勇猛。志願無惓者，即第二加行精進，加脩以進故。求清白法者，即第三無足精進，修不已故。即自利修也。惠利群生者，即利他修也。

Regarding the passage from "courageous and vigorous" to "benefiting the multitude of living beings": The commentary states: Second is cultivating goodness. It has three parts: this first is unremitting cultivation. "Courageous and vigorous" is the initial vigor; having vowed not to fear the enemy, it is called "courageous." "Vows without weariness" is the second, applied vigor, advancing by adding cultivation. "Seeking the pure, white dharmas" is the third, insatiable vigor, cultivating without stopping. These are cultivations for one's own benefit. "Benefiting the multitude of living beings" is cultivation for benefiting others.