Yesterday, I watched GF for the 1st time in like half a year, and it rose a question. When Michael, Tom, Sonny and Clemenza plan Sollozos killing, Michael says the famous "Its not personal, its strictly business". But, the novel says that Vito taught Michael to regard everything as personal. Did Mike just say it so Sonny would agree with him killing Solozzo and McCluskey, or was it something else?