the steps of aa helped me find causes and conditions for the mass quantity of resentments i had and helped me be free of them.
that line you quoted,"resentment is the ultimate killer of the alcoholic", is from the 4th step. thats where i learned causes and conditions for my resentments,fears, and the sex inventory helped me learn even more.
my 4th step was done,of course, after i did the first 3 steps.
then after the 4th, continued with the rest of the steps.