He also recognized the calm that follows. As adults we can remind ourselves that this is the case. Sometimes, we do not forget quickly the way Arthur did, as to what made us angry. We can recall that in our previous encounters with rage, with time, we too forget. Often, in the light of calm after the storm, we do not remember the stimulus.
Rage is an error.
We create insanity when we indulge in self-righteous anger. Because rage is our ego-creation we have difficulty recognizing it as a mistake. We do not easily find error in that which we create. The Course says you love your recreations. Every response you make to everything you perceive is up to you, because your mind determines your perception of it.