大方廣佛華嚴經疏 20.19

20.19

四進中，普發眾業，是無餘修，亦利樂勤。常修靡懈，是長時修。恒不退轉，是無間修。上即加行勤也。勇猛莫制，是勇捍修，亦被甲勤。「於諸」已下是顯度相。

In the fourth, vigor, universally giving rise to all activities is cultivating without remainder, and also the exertion of benefit and bliss. Constantly cultivating without remiss is cultivating for a long time. Ever non-regressing is cultivating without interruption. The above are the exertion of preparatory practice. Valiant and unhindered is heroic cultivation, and also the armor-like exertion. From "In all..." downward reveals the marks of the perfection.