Full Idea
Our innate equality is independence from being bound by others to more than one can in turn bind them.
Gist of Idea
Equality is not being bound in ways you cannot bind others
Source
Immanuel Kant (Metaphysics of Morals I: Doctrine of Right [1797], Div B)
Book Reference
Kant,Immanuel: 'The Metaphysics of Morals', ed/tr. Gregor,Mary [CUP 1991], p.63
A Reaction
This doesn't seem to capture the whole concept. The two of us may be unequally oppressed by a third. We are unequal with the third, but also with one another, though with no binding relationships.