explain macbeths siloquy at the beginning of act 1 scene 7

The siloquy is all about Macbeth reasons for murdering or not murdering Duncan. I love that Shakepeare uses these brilliant peeks into Macbeth's thoughts......... in the end, we understand his reason for not killing Duncan, and they would be; punishment in the afterworld, Duncan hadn't been a harsh king and didn't deserve to be murdered, and that he himself could not be responsible for the murder of the man in his own home. He understands that his desire to be rid of Duncan come from the desire to take hi position. He wants Duncan dead for all of the wrong reasons.