…thee, for he was the most humble-minded and courteous knight of his time, and moreover a great protector of damsels; but some there are that might have heard thee, and it would not have been well for thee in that case; for they are not all courteous or mannerly; some are ill-conditioned scoundrels; nor is it everyone that calls himself a gentleman, that is so in all respects; some are gold, others pinchbeck, and all look like gentlemen, but not all can stand the touchstone of truth.
There are no more uses of "touchstone" in the book.
Show samples from other sources
"I’m not a good touchstone to use for judging your sanity."
Patrick Rothfuss -- The Name of the Wind
I considered Yamacraw a touchstone: if the Yamacraw children knew about it, then the chances were excellent that the vast majority of American children had been reached.