俱舍論頌疏論本 30.10

30.10

撥俗我為無，便壞善業子者，釋第二句也。因果相續世為假我，撥此為無，便壞善業，如子生勝果故，合前大緩喻也。

'If one rejects the conventional self as non-existent, one destroys the cub of good karma' explains the second line. The continuum of causes and effects is conventionally a nominal self; rejecting this as non-existent destroys good karma, just as the cub brings about excellent fruits, which corresponds to the previous analogy of being too loose.