Irony and Personification
"They did not know that i did it for myself, that pride, whose slave I was, spoke to me louder than all their voices, that Doodle only walked because i was ashamed of having a crippled brother." - Hurst
This shows that Doodles brother did not do it for Doodle he only did it for himself.
"There is within me (and with sadness I have watched it in others) a knot of cruelty borne by the stream of love, much as our blood sometimes bears the seed of our destruction, and at times I was mean to Doodle." -Hurst
Brother's selfishness got in the way of caring for his brother because of how Doodle was.