大毘盧遮那成佛經疏 16.3

16.3

Next, in answering how many kalpas the fruit numbers and the lifespan last: the power of all mantras of worldly deities does not exceed one kalpa at most. Those spoken by the Buddha exceed the measure of a kalpa, meaning exceeding one kalpa, and exceeding another kalpa, thus immeasurably up until attaining buddhahood. Therefore, the lifespan and fruits of the siddhi maintained by worldly people have a numerical limit not exceeding one kalpa. Now, [the Buddha's] is not lost, its lifespan is inexhaustible, exceeding the measure of the count of kalpas. If explained in terms of phenomenal practice, merely according to one's capacity one can exceed a certain number of kalpas, or exceed immeasurable kalpas with an inexhaustible lifespan, also surpassing those worldly devas. Therefore, saying "transcending kalpas" is a comprehensive and indefinite phrasing. To speak strictly of the reality of the lifespan: it surpasses the count of kalpas, and the retribution received is also without limit.