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.

— Jon Krakauer

Alex here. (...) Ron, I really enjoy all the help you have given me and the times we spent together. I hope that you will not be too depressed by our parting. It may be a very long time before we see each other again. But providing that I get through the Alaskan Deal in one piece you will be hearing form me again in the future. I’d like to repeat the advice I gave you before, in that I think you really should make a radical change in your lifestyle and begin to boldly do things which you may previously never have thought of doing or been too hesitant to attempt. So many people live within unhappy circumstances and yet will not take the initiative to change their situation because they are conditioned to a life of security, conformity, and conservatism, all of which may appear to give one piece of mind, but in reality nothing is more damaging to the adventurous spirit within a man than a secure future. The very basic core of a man’s living spirit is his passion for adventure. The joy of life comes from our encounters with new experiences, and hence there is no greater joy than to have an endlessly changing horizon, for each day to have a new and different sun. (...) Once you become accustomed to such a life you will see its full meaning and its incredible beauty. (...) Don’t settle down and sit in one place. Move around, be nomadic, make each day a new horizon. (...) You are wrong if you think joy emanates only or principally from human relationships. God has placed it all around us. It is in everything and anything we might experience. We just have to have the courage to turn against our habitual lifestyle and engage in unconventional living. Ron, I really hope that as soon as you can you will get out of Salton City, put a little camper on the back of your pickup, and start seeing some of the great work that God has done here in the American West. You will see things and meet people and there is much to learn from them. And you must do it economy style, no motels, do your own cooking, as a general rule spend as little as possible, and you will enjoy it much more immensely. I hope that the next time I see you, you will be a new man with a vast array of new adventures and experiences behind you. Don’t hesitate or allow yourself to make excuses. Just get out and do it. Just get out and do it. You will be very, very glad that you did. Take care Ron, Alex

— Jon Krakauer

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.

— Jon Krakauer

Because I was alone, however, even the mundane seemed charged with meaning. The ice looked colder and more mysterious, the sky a cleaner shade of blue. The unnamed peaks towering over the glacier were bigger and comelier and infinitely more menacing than they would have been where I in the company of another person. And my emotions were similarly amplified: The highs were higher; the periods of despair were deeper and darker. To a self-possessed young man inebriated with the unfolding drama of his own life, all of this held enormous appeal.

— Jon Krakauer

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.

— Jon Krakauer

But [Everett] and McCandless, at least they tried to follow their dream. That’s what was great about them. They tried. Not many do.

— Jon Krakauer

But some things are more important than being happy. Like being free to think for yourself.

— Jon Krakauer

Common sense is no match for the voice of God.

— Jon Krakauer

From elementary school through high school, my siblings and I were hectored to excel in every class, to win medals in science fairs, to be chosen princess of the prom, to win election to student government. Thereby and only thereby, we learned, could we expect to gain admission to the right college, which in turn would get us into Harvard Medical School: life's one sure path to meaningful success and lasting happiness.

— Jon Krakauer

Happiness [is] only real when shared

— Jon Krakauer