The result was that I felt fearful, guilty, and disconnected from my brother. Another result was that he became even more vicious in his attacks. I could have easily predicted these results myself and not had to learn the hard way once again.
The conquering of temptation is something that must be handled over time, bit by bit, experience by experience. ACIM is a mental and experiential discipline that teaches us to give up every form of the temptation to think or behave out of fear. Diligent practice will show us more and more that it is never worthwhile to attack. Being conscious of the decision-making process inevitably leads us to make better decisions as we go. I have gotten to the point now that I actually feel it in my heart (I literally feel pain in my chest area) when I attack somebody. I still give in to temptation once in a while, but the consequences are so overwhelming now, that I have a very palpable incentive not to give in.
Existential philosophy teaches that with responsibility comes freedom. However, freedom is scary to some people because that means that they have to be responsible for themselves. Much like ACIM, blaming anything but ourselves for our state is like being in prison because we are at the mercy of something we perceive to be outside of ourselves and have no control over. If we are the choice-makers (which we are of course), then we are free from our illusory bondage. Ignorance of this truth can create sadness, depression, or a sense of helplessness. Embracing it can lead to a life of fulfillment and evolution.
All of this is why a vigilant, disciplined approach to ACIM can only lead to happiness. The conquering of temptation is fundamental to our progress. (I would like to note that in my experience, a regular meditation practice takes a significant edge off of temptation.) The fears that we have on a daily basis are very convincing. I remember a much needed break-up I went through when I actually said to myself "This feeling is so bad, that I certainly must be doing the wrong thing". That feeling was fear, and fear is always misleading. If we can find a way to decipher between a temptation to give in to fear or the opportunity to ask for a different way, things are bound to improve in our lives.
Blessings,
Daniel