俱舍論頌疏論本 7.13

7.13

三因於正生者，謂同類、遍行、異熟三因，於正生位而興作用。言正生者，謂未來法，居生相位，生現前故，名正生時。由此三因所引果法，至生相位興與果用。此上兩句，明因緣竟。

'Three causes [act] at the point of arising' means that the three causes—similar-cause, universal, and fruition—exercise their activity at the stage of arising. 'At the point of arising' refers to future dharmas; residing at the characteristic of arising, because arising is present before them, it is called the point of arising. Because the effect-dharmas projected by these three causes reach the characteristic of arising, they exercise the function of giving effect. These two lines above complete the explanation of the causal condition.