could be generous and caring to a fault, but he had a darker side as well, characterized by monomania, impatience, and unwavering self-absorption, qu… - Jon Krakauer

He was right in saying that the only certain happiness in life is to live for others...

"Boredom presents a very real, if insidious peril. To quote Blaine Harden from the Washington post:“Boredom kills, and those it does not kill, it cripples, and those it does not cripple, it bleeds like a leech, leaving its victims pale, insipid, and brooding. Examples abound...Rats kept in comfortable isolation quickly become jumpy, irritable, and aggressive. Their bodies twitch, their tails grow scaly." The backcountry traveler, then, in addition to developing such skills as the use of a map and compass, or the prevention and treatment of blisters, must prepare mentally and materially to cope with boredom, lest his tail grow scaly.

He read a lot. He used a lot of big words. I think maybe part of what got him into trouble was that he did too much thinking. Sometimes he tried too hard to make sense of the world, to figure out why people were bad to each other so often. A couple of times I tried to tell him it was a mistake to get too deep into that kind of stuff, but Alex got stuck on things. He always had to know the absolute right answer before he could go on to the next thing.