One very telling quote is :
"One of his last acts was to take a picture of himself, standing near the bus under the high Alaska sky, one hand holding his final note toward the camera lens, the other raised in a brave, beatific farewell. His face is horribly emaciated, almost skeletal. But if he pitied himself in those last difficult hours - because he was so young, because he was alone, because his body had betrayed him and his will had let him down - it's not apparent from the photograph." Chapter 18, pg. 199
What is so good about this quote is that it shows his maturity. It shows that all of the immature thinking he had been consumed with, as a reaction toward his father, had been eradicated in the immense suffering he endured. Pity was not something he could afford to feel, in the end because survival required more of him.
"'You could tell right away that Alex was intelligent,' Westerberg reflects, draining his third drink. 'He read a lot. 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."' Chapter 3, pg. 18
This passage reveals how much inner turmoil hris was in; and maybe why he would want to go on a solitary journey.
"He was so enthralled by these tales, however, that he seemed to forget they were works of fiction, constructions of the imagination that had more to do with London's romantic sensibilities than with the actualities of life in the sub arctic wilderness. McCandless conveniently overlooked the fact that London himself had spent just a single winter in the North and that he'd died by his own hand on his California estate at the age of forty, a fatuous drunk, obese and pathetic, maintaining a sedentary existence that bore scant resemblance to the ideals he espoused in print." Chapter 5, pg. 44
This passage is revealing of the tendency toward idealizing another human being that Chris had. It was as if he wanted to emulate someone else's adventure so he could capture that person's experience.