What is Tom's opinion about honesty? Does he change his attitude at all?

Tom does change towards the end of the novel. In the early stages Tom shows his cleverness for manipulation (the whole fence painting thing) He is never malicious but creative trickery was part of his persona as a clever and tough kid. By the end of the novel we see changes. Tom is concerned about the welfare of Muff Porter. He does save the widow's money and he does not seem too concerned about his reward. Tom even tries to set his friend Huck on the straight and narrow until they can embark on another adventure. Tom's honesty extends to his feelings as well. He had always appreciated his aunt Polly but, like many boys, rebuked her at every step. By the end of the novel he is more honest with his feelings; Tom kisses her on the cheek instead of making a quick joke or running away.