The buddhistic teaching shows the way to enlightenment. The wisdom beyond words can be gained by meditation. How we therefore have to proceed i.e. with an advanced acknowledgement how we must subdue our mind and abide, the Buddha explains in the Diamond Sutra. He does not describe a theory of epistemology but instructs a practice of cognition. It can only be excercised by meditation.
The text of the Diamond-Sutra should be read and understood as a hint to join the practice of a Zen-Temple under the guidance of a Zen Master.
With best regards,
Hyun Jung