What are some quotes from Into the Wild by Jon Krakauer that prove that Chris McCandless is a pilgrim?

To
understand Chris's journeying, we need to distinguish between a tourist and a pilgrim. A tourist
travels for novelty, to see new sights, and to have a break from everyday life. Often the goal
is simply pleasure. The tourist may come home with a thousand photos and a pile of souvenirs,
but he doesn't expect to be profoundly changed by his journey.

The pilgrim,
on the other hand, travels for the purpose of spiritual transformation. He wants not to consume
his new surroundings but to be changed by them. He journeys not for superficial pleasure but to
more fully encounter both the divine and his own soul.

Much of what Chris
wrote and did reveal a pilgrim, a person seeking soul transformation. Chris did not desire
superficial pleasure. He sought the deep joy, often accompanied by hunger or physical discomfort
(the opposite of pleasure), that comes when we live life fully. As he writes to Ron:

The joy of life comes from our encounters with new experiences, and
hence there is no greater joy...