“If we actually touch fire, we will certainly be burned, but if we merely say the word fire without actually touching it, we won’t be burned. Likewise, if we only think of the word fire, our heads will not be set ablaze. Therefore, the definition of fire, whose nature is to burn all things, cannot itself be the reality of it.”
Kosho Uchiyama
If I’m not mistaken koans are typically based on much older stories. This guy is 20th century. Great question though!