I expected an easy-read help-yourself-book and though this was certainly not exactly academic, it was still more sophisticated and theoretical than I had anticipated.
Still, I was only moderately impressed. 'Wisdom', to begin with, feels like a somewhat archaic notion, much as I do dote on the Gandalfey/Dumbledoresque types of this world; a quick look in a thesaurus could have informed Einhorn there are plenty of more up-to-date synonyms to pick from (not that he doesn't seem to know his way round a book).
Moreover, his whole reasoning, despite enlightening anecdotes to bolster his theories, felt a bit passé yet self-evident.
I ought perhaps to have gone for something even more mainstream?