Can someone help me find quotes that relate to nobility in Huck Finn?

There are a few ways to look at this question. While on
the river, Huck and Jim run into two con men, who call themselves the Duke and the
Dauphin (King). These men pretend to be nobility, but "these liars warn't no kings nor
dukes, at all, but just low-down humbugs and frauds." The Duke and King are the furthest
thing from real nobility, but they play the part, "All I say is, kings is kings, and you
got to make allowances. Take them all around, they're a mighty ornery lot. It's the way
they're raised." (chapter 23)

However, the real noble
characters in this book are Huck and Jim. Huck decides to help his friend even though he
himself might be damned for doing so, "I was a-trembling, because I'd got to decide,
forever, betwixt two things, and I knowed it. I studied a minute, sort of holding my
breath, and then says to myself:All right, then, I'll GO to hell." (Chapter
30)

Huck helps his friend escape, not because its the right
thing to do (he believes that it is wrong, based on what he has been taught) but because
he just can't bring himself to turn in his friend. It is an innate instinct in Huck that
he must do what he can for his friend, regardless of consequences. Jim, in turn, cares
for Huck and helps him throughout their journey. 

Another
quote that I think illustrates nobility or noble behavior on Huck's behalf is when he
watches the Duke and King get tarred and feathered. Even though the Duke and King were
such terrible human beings and were mean to Huck, Huck didn't believe they deserved such
a terrible death.

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"Well, it made me sick to see it; and I was sorry
for them poor pitiful rascals, it seemed like I couldn't ever feel any hardness against
them any more in the world. It was a dreadful thing to see. Human beings can be awful
cruel to one another." (chap
33)

Another instance of noble
behavior/not-noble behavior you may want to look at is the lynch mob scene in chapter
22. In this scene a man named Boggs threatens a gentleman named Sherburn. Sherburn warns
him to leave peaceably and Boggs doesn't, so Sherburn shoots him. The lynch mob forms to
lynch Sherburn, but Sherburn talks them down:

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"Your newspapers call you a brave people so much
that you think you are braver than any other people-- whereas you're just as brave, and
no braver. Why don't your juries hang murderers? Because they're afraid the man's
friends will shoot them in the back, in the dark -- and it's just what they WOULD
do."

He challenges the notion
of "Southern justice" and chastises the crowd for being followers and getting caught up
in a mob mentality. 

Hope this gives you some things to
think about!