The Law of One is Self-Love: Self-Love is Oneness.

Self-Love is the Eigenstate; it is the state of one's self which we call existence. What it means is that existence is one self-loving unity in which all that exists is Self-Love itself. One's Eigenstate is Self-Love; Self-Love is One's Eigenstate. There's no formula for it for 'Self-Love is the Law of One' which upholds itself; it thus already unifies all. We can, therefore, simply name it 'One'.
~ Wald