Why is it so much reading
"O, never/Shall sun that morrow see!" means "The morning when Duncan leaves here will never come, because we're going to kill him tonight." "Your face, my thane, is as a book where men/May read strange matters" means "By looking at your face, everybody can see what you're thinking." The rest of the speech means "To fool everybody, you have to behave the way everybody expects you to behave. You have to make sure that the way you look, the way you act, and the way you talk all seem to be giving Duncan a friendly welcome. You have to seem harmless even though you are secretly deadly."
That it's not the object itself that is good or bad. It's whoever THINKS it to be good or bad. Such as the Bible can be interpreted to mean what is convenient to you, but not what is truly meant of the Bible.
