俱舍論記 5.121

5.121

「有謂有行至恒行不息」者，義便兼破勝論。此即敘也。彼計德句義有二十四種，行是第二十一，故言是德差別。彼計諸法從此至彼速疾迴轉等，皆由行力有。勝論外道謂執有行是德句差別，依箭等生。由彼行力故，彼箭等乃至未墮，恒行不息，如鳥銜菓。

"Some say that there is velocity… moving constantly without cessation" serves the incidental purpose of refuting the Vaiśeṣikas. This is its exposition. They hold that the category of quality (guṇa-padārtha) has twenty-four kinds, velocity (saṃskāra) being the twenty-first; hence it is called a specific quality. They hold that the rapid movement of phenomena from here to there and their turning around are all due to the force of velocity. The Vaiśeṣika outsiders maintain that there is velocity, which is a specific quality belonging to the category of quality, arising dependent upon an arrow or the like. By the force of that velocity, that arrow or the like moves constantly without cessation until it falls, like a bird carrying a fruit.