In Mere Christianity, Lewis describes Christianity as a hallway with a bunch of doors. We Christians are all in the same hallway grounded in Christ, but it is up to us to choose which door we choose to go through. These doors describe all of the different denominations of Christianity. The thing that we all must remember is that when we all come out of our rooms, we are standing in the same hallway. I really like this analogy because I think that different denominations focus too much on their differences. While important key differences should be discussed with healthy attitudes, we must remember that we are all grounded in Christ. Christ said that we should all be one just as He is one with us.
Lewis says later in the article that impulses are neither bad or good, but how we react to our impulses is bad or good. I disagree with his thoughts on this because I think that he simplifies this idea a little bit too much. If we have an impulse that is bad, that mere thought of killing someone for example is a sin against the Lord most high. Anytime we are even thinking something sinful, it is a sin. Before the fall, man was good; only capable of producing evil. After the fall, man is consumed with sin; only capable of producing good by the grace of the Holy Spirit given to God's chosen people.