瑜伽師地論略纂 11.120

11.120

論解一切種精進中有六種，無動精進中「亦不轉成餘性分」者，謂菩薩唯觸苦觸不退，亦不退入餘二乘性分故。「所以說言：有勢有勤等六，屬前六種」者，謂有堅、有猛，參餘四，有六種也。　七種中，第三中云「如滅頭然」者，然謂生然，言急當如救頭，云背也。

In the treatise's explanation of all varieties of vigor, there are six kinds; in unshakeable vigor, where it says "also not turning to become of another disposition," this means that the bodhisattva does not regress solely upon experiencing painful contact, nor does he regress and enter into the disposition of the other two vehicles. Regarding "therefore it is said: having vigor, having exertion, and so on, six kinds belonging to the preceding six kinds," this means that having firmness and having fierceness, joined with the other four, make six kinds. Among the seven kinds, in the third it says "like putting out a fire on one's head": "fire" means an arising blaze, meaning one should act urgently as though saving one's head, saying [or] one's back.