Precept 13 is self-refuting
13. The claim that mystical experiences can give us knowledge.
This is self-refuting.
To differentiate between what a mystical experience is and a non-mystical experience presupposes there is a difference that can be measured, detected, reported or whatever. The mere fact that people are reporting that they have, or had experiences that are considered qualitatively different from others is a piece of knowledge.
When Rook claims that the statement 'mystical experience gives us knowledge' is false, and irrational he's basing this of his knowledge of claims by those who have had experiences that they consider mystical - in short Rook's claim presupposes that there has been knowledge gained by these kinds of experiences.
You're welcome guys, hope to see the list shortened to 12!
[mod edit: Rook didn't write this precept.]