釋氏要覽 2.346

2.346

即五趣也。一天。二人。三地獄。四畜生。五餓鬼。謂修羅四趣皆攝故。今開為一趣。故云六趣也。趣者何義。毘婆沙論云。所往義。是諸有情。所應往結生之處故名趣也○毘曇論云。趣到義。謂彼善惡業因能令有情到其生處。又道義。故名六道矣。

These are the five destinies: first, devas; second, humans; third, hells; fourth, animals; fifth, hungry ghosts. Because the asuras are subsumed in all four destinies, they are now set open as one destiny, and thus they are called the six destinies. What is the meaning of 'destiny' (gati)? The Vibhāṣā-śāstra states: "It has the meaning of 'where one goes'; because it is the place to which sentient beings ought to go and take rebirth, it is called a destiny." The Abhidharma-śāstra states: "It has the meaning of 'reaching' or 'arriving'; it means that those wholesome and unwholesome karmic causes can cause sentient beings to arrive at their place of rebirth. It also has the meaning of 'path' (mārga); hence they are called the six paths."