What is the theme in On the Genealogy of Morals by Friedrich Nietzsche?

The origins of good is a theme in the book. Nietzsche contrasts master and slave morality, also called noble and herd morality. He claims "good" or "bad" originally just describes the nobles without moral impact. Nietzsche states moral value is imputed by slaves who resent the nobles and consider their actions vices. This slave revolt has a cultural effect that replaces strength and action of the rich nobles with passivity and flatness of the meek who inherit the earth. Nietzsche's inquiry into the origins of good are focused around four key components.