yatpunaḥ pūrvakaṃ tat kāraṇabhūtaṃ jñānaṃ tasya na{ca} tat prāpaṇaśaktiḥ prāmāṇyam ucyate /
As for that prior cognition which has become the cause, its validity is said to be [nothing but] that capacity to bring about [the result].