If you admit you are a person, and you admit I am a person, and you don’t diverge from the law of identity (p=p) of indiscernibles, then your thinking, acting, and interpreting/valuing/purposing will be in accordance to person=person (self=other).
And you will wonder about its existential import, since not a single one of us is always aligned with that reality — a reality in which “reality divergence” (and reconvergence) is apparently baked in.