Behold a super-satured solution. A crystal touches it and where before was a liquid, now hard unyielding crystals spring forward, hard enough to scratch diamond. Some books are seed crystals, changing the shapeless into eternal forms.
All books can be seed crystals, provided they find an appropriate super saturated solution in their readers (that was my point, actually, as a counter argument to OP's "preaching to the choir". Although the super saturated solution is already there, it needs to seed crystal to (physically) transform).