"you better call the troopers. There's a man back in the bus by the sushana. Looks like he's been dead for a while."
Surviving in the wild
"Then, smiling broadly, he disappeared down the snow-covered track."
Change for the better
"...I am injured, near death, and too weak to hike out of here..."
"Near the end of his trip, it turned out, Chris had gotten lost in the Mojave Desert and had nearly succumbed to dehydration." This shows Chris going to the max to achieve his goal and try to succeed in the wild.
“Immediately after graduating, with honors, from Emory University in the summer of 1990, McCandless dropped out of sight. He changed his name, gave the entire balance of a twenty-four-thousand-dollar savings account to charity, abandoned his car and most of his possessions, burned all the cash in his wallet. And then he invented a new life for himself, taking up residence at the ragged margin of our society, wandering across North America in search of raw, transcendent experience.” Chris truly believes in himself and his mindset is determined to get to his full potential and survive.
"Jim Gallien had driven four miles out of Fairbanks when he spotted the hitchhiker standing in the snow beside the road, thumb raised high, shivering in the gray Alaska dawn." This shows Chris being determined and fearless by just standing and waiting for the next opportunity.