It's the things we love most which can also most hurt us.
In the psychometrics literature, the one unalloyed good may be IQ. I've always found this to be hard to believe in part because of the rarity of an unalloyed good. Many stories about the pitfalls of being just smart enough to hurt oneself.
All very interesting and the kind of discussion that the reader might become deeply involved in, endlessly analyzing, dissecting, probing, etc. But for one who simply allows life to be as it is, moment to moment, this is a more or less shallow amusement. Not that there's anything good-bad or right-wrong about shallow amusements.