For instance; you slander the ego for whatever reason, but it is only the ego that has the capacity to make such value-judgements.
From Nietzsche:
In the first place a being capable of absolutely unegoistic conduct is as fabulous as the phoenix. Such a being is not even thinkable for the very reason that the whole notion of "unegoistic conduct," when closely examined, vanishes into air. Never yet has a man done anything solely for others and entirely without reference to a personal motive; indeed how could he possibly do anything that had no reference to himself, that is without inward compulsion (which must always have its basis in a personal need)? How could the ego act without ego?