Stanley Kubrick uses the characters from The Shining to illustrate several different points. Focusing on Jack, Kubrick shows the audience the importance of love, selflessness, and forgiveness. Jack claims to love his family and states how much he loves Danny, but his actions speak differently. Even before getting to the hotel, Jack has already injured Danny in the past. He claims that it was just an accident, but he still dwells on the incident. This is partly due to his wife because she has not let him forget about what he did to Danny. Not only does his wife not forgive him, Jack does not seem to have fully forgiven himself. This is revealed to the audience when Jack is talking to the ghost bartender. As he explains the events of the past to the bartender, he is trying to make an excuse for what he did to Danny and relates it as an accident. Regardless of whether or not it was an accident, Jack’s emphasis on the fact that it was an accident indicates that he is ashamed of himself for hurting his son. Jack’s inability to forgive himself stems from his selfish nature. This is made apparent to the audience by the disconnect between Jack and his son. Whenever Jack and Danny are filmed having a conversation, the dialogue sounds so dry and lacks the expected affection a father and son should have for each other. Jacks’ selfish nature is evident in his unwillingness to take his son to the hospital and his focus on himself and his “responsibilities” to the company. By this point in the story Jack has been completely overtaken by the demonic presence of the hotel. However, Jack is able to be possessed due to his lack of love, forgiveness, and selflessness towards himself and his family.
FASTER THAN THE WRITTEN WORD 
Tony,
This post focuses on characterization in Kubrick’s The Shining. In particular, you tackle Jack’s character, asking how various elements of his personality lend shape to his experiences at the Overlook hotel. I’m glad that you point out the fact that he has harmed Danny in the past. While the film primarily charts his deterioration once he takes the job at the hotel, this fact complicates things, since we know he has a history of domestic violence. (In other words, one wonders if the hotel’s possession is so successful because of this history and Jack’s predilection for violence.)
My only critique of the post is that it feels a bit under-developed. You could discuss more examples and perhaps analyze a key scene or two. (For instance, it would be useful to discuss in detail a scene where Jack and Danny interact, since that’s one of the main points of your post.)
Nevertheless, solid post,
MT