Common sense is no match for the voice of God.

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.

Although the far territory of the extreme can exert an intoxicating pull on susceptible individuals of all bents, extremism seems to be especially prevalent among those inclined by temperament or upbringing toward religious pursuits. Faith is the very antithesis of reason, injudiciousness a crucial component of spiritual devotion. And when religious fanaticism supplants ratiocination, all bets are suddenly off.

The trip was to be an odyssey in the fullest sense of the word, an epic journey that would change everything.

According to the moral absolutism that characterizes McCandless's beliefs, a challenge in which a successful outcome is assured isn't a challenge at all.

Mr. Franz, I think careers are a 20th Century invention and I don't want one. You don’t need to worry about me; I have a college education. I’m not destitute. I'm living like this by choice.

Military investigations are designed not to find anyone guilty.