What are some important quotes from chapters 6-8 of Into the Wild?

I would personally say that there are two important quotes
in these chapters, but of course, you have asked a very subjective question, so I would
recommend that you read these chapters yourselves and try and relate their contents to
the overall theme of the book and pick out any important
quotes.

Firstly, I would argue that the letter that Ronald
Franz writes to the author where he comments on his impressions of Chris McCandless is
significant (page 49 in my edition):

readability="6">

Please do not make these facts available to
anybody till I know more about his death for he was not just the common wayfarer. Please
believe me.

I believe this
quote is important because it indicates the massive impact that Chris McCandless had on
those around him, especially Ronald Franz. It also makes it harder for us to just
casually dismiss Chris and his exploits as being a stupid stunt. Franz's belief that
there was something "special" about Chris and his philosophy and approach to life
necessitates a closer examination of his motives and
beliefs.

Secondly, and very interestingly, the comments
made by others about Chris and his lack of common sense are worthy of attention, as they
suggest a character with more brains than common sense. Note what the text tells us in
Chapter Seven (pages 63-64 in my edition):

readability="10">

Nor was McCandless endowed with a surfeit of
common sense. Many who knew him have commented, unbidden, that he seemed to have great
difficulty seeing the trees, as it were, for the
forest.

Although he was said
to not be a "space cadet," many agree that there were "gaps in his thinking." As we
struggle with the author to develop an analysis of this confusing and troubling figure,
this is another piece of vital information that points to the many different aspects of
Chris's character: part visionary, part Romantic, part intelligent, cynical, world-weary
youngster in search of a purer way of living.