The ego’s version of hierarchy is status or rank. It is constantly reassessing itself on a scale of “better than/worse than.” This manifests in obvious measures such as money, power, looks, fame, etc., culminating in the attitude “Do you know who I am?” There are any number of subtle and not-so-subtle ways we use to draw attention to ourselves; even among “spiritual” people there are little emblems of rank that assert their superior holiness. We are all at times like the Pharisee*, thankful that we are not like these others. But if we beat our breasts like the tax collector, we are still judging ourselves on a scale. I can still want you to notice how humble I am.
This judging also works in more subtle and insidious ways; the inner sense of superiority or inferiority that we all carry, and that operates the little voice of criticism in our heads. Someone cuts in front us while driving and we feel compelled to comment on their lack of driving skill. We notice a very attractive person and our voice says we could never get to know them. These things seem trivial, but they define the borders of our world: better/worse, I am still other and alienated from you. I do not know myself, and you, as the One.