What does an a really good introduction need to include?

"the trouble is," sighed the doctor, grasping her meaning intuitively, "that youth is given up to illusions. it seems to be a provision of nature; a decoy to secure mothers for the race. and nature takes no account of moral consequences, of arbitrary conditions which we create, and which we feel obliged to maintain at any cost." what larger idea is the doctor referring to when he says that nature takes no account of moral consequences? impulses often overrule a person’s sense of good and bad. nature forces women into motherhood. young people are prone to having delusions. morals play no role when we choose who we love.

Which revision of this sentence best uses direct characterization?

After huck's talk with mary jane, she says she'll pray for him. huck thinks: "pray for me! i reckoned if she knowed me she'd take a job that was more nearer her size." in at least 150 words, explain this statement by describing how huck views himself and his behavior in general.