From the Buddha's Kalama Sutra:
Do not go upon what has been acquired by repeated hearing,
nor upon tradition,
nor upon rumor,
nor upon what is in a scripture,
nor upon surmise,
nor upon an axiom,
nor upon specious reasoning,
nor upon a bias towards a notion that has been pondered over,
nor upon another's seeming ability,
nor upon the consideration, "The monk is our teacher."
Rather, when you yourselves know: "These things are good; these things are not blamable; these things are praised by the wise; undertaken and observed, these things lead to benefit and happiness," enter on and abide in them.'
People want to tell everything instead of telling the best 15 words. They want to learn everything instead of the best 15 words. In this thread, instead post the best 15-words from a book you've read recently (or anything else). It has to stand on its own. It's not a summary, the whole value needs to be contained in those words.
I'll start in the comments below.
(Voted by the Schelling study group as the best exercise of the meeting.)