What are some "words of wisdom" from the book The Outsiders?

The Outsiders is a book about poor
teenage kids, greasers, and their conflict with rich kids, Socs. Characters on both
sides of the class divide speak words of wisdom about their life
circumstances.

In chapter 3, Cherry Valance speaks for the
Socs, describing how hard it is to have everything one
wants:

Did you
ever hear of having more than you wanted? So that you couldn't want anything else and
then started looking for something else to want? It seems like we're always searching
for something to satisfy us, and never finding
it.

Ponyboy Curtis, the main
character, describes the greasers' perspective throughout the story. In chapter 12, he
reflects that many boys die, as his friend Dallas died, because they have nothing and do
not know what they can live for:

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I could see boys going down...because they were
mean and tough and hated the world, and it was too late to tell them there was still
good in it, and they wouldn't believe you if you
did.