A strong conclusion will restate the thesis statement and broaden the scope of the essay in four to six sentences. You should also have an effective last sentence in the essay so you can wrap it up on a high note.
Huck decides not to tell anybody of Jim's escape because if Jim stayed back, he would have been sold. Huck and Jim are both alienated from the society in a number of ways. Their fates are linked right from the first part of the novel. Freed from the hypocrisy of the society they create a heaven of their own.
In this excerpt from the play The Tragical History of Doctor Faustus, the line that provides evidence that Faustus's human soul is predisposed to shun evil is the second one:
But, Mephistophilis, My blood congeals,
and I can write no more.
This line, as Marlowe uses blood as a symbol for the character of Faustus's soul, shows the reader his intention to avoid evil, but he feels he can't because it "<em>congeals</em>".