Christianity is the way that the slavish, Jewish values of good and evil spread throughout the world.
Examples of these nobles include the ancient Greeks and Romans as well as the Goths and Vikings. All the qualities associated with goodness according to the master morality become evil to the slave moralist. The first essay, "'Good and Evil,' 'Good and Bad'" contrasts what Nietzsche calls "master morality" and "slave morality.
The master cannot choose to be weak in the same way that a bird of prey cannot choose not to eat a lamb.
Nietzsche goes on to argue towards the end of the first essay that we can see evidence of these values triumphing when we go to Rome.
Their theories suggest that, originally, people benefiting from the unegoistic actions of others would applaud those actions and call them "good. Nietzsche, F. Vintage: New York.
Nietzsche finds in this a fundamental flaw; to him goodness is not derived from those to whom goodness is shown, instead it is the noble or powerful man who sees his own actions as fundamentally good.