A business tycoon, drunk one day, said something heartfelt. He said, "I'll teach you the most ruthless way to judge people; it'll last you a lifetime." If you want to see through someone, don't bother analyzing their nature or trying to figure out their motives; that's too abstract. Just observe them quietly. Observe the three or five people they hang out with most often to see what kind of people they are. If his circle is filled with idlers, bigmouthed, and calculating people, then you can be sure he won't be able to pretend to be a gentleman for long. Birds of a feather flock together; people of the same kind don't just say it for fun; it's a law of survival ingrained in us. My back went numb when I heard that. Simplicity is truly the ultimate truth. Looking back, all the pitfalls we've fallen into over the years, all the bad people we've encountered, have they not already given us a heads-up through their social networks? It's just that we ourselves always want to believe that "he" is an exception. A person's social circle is the reflection of his soul, which cannot be hidden.