I celebrate myself, and sing myself, and what i assume you shall assume, for every atom belonging to me as good belongs to you. the speaker's allusion to himself introduces his , or his way of thinking about and seeing things.
Looking at his ego-tism, the writer believes that everything about him that is good belongs to the other person. He believes that "every atom" belonging to him that is a "good" atom belongs to the other person. Therefore, it is presenting some control over the other person's way of seeing the speaker.
