For questions 1 and 2: this is an existential discussion. As I haven't read the book, I can't say exactly what is meant by these terms, but they seem to imply being true to self. For your 3rd question, there is a question mark because the sentence begins with Had you thought it, then?
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Elanguest"a glance captures more than a glimpse" -- http://thesaurus.com/browse/glance ;)Well, then, you're stuck with the perennial internet dilemma: who you gunna believe?