Full Idea
Rightful equality within a state is a relationship among citizens where no-one can put anyone else under a legal obligation without submitting simultaneously to a law which requires that he can be put under the same kind of obligation by the other person.
Gist of Idea
Equality is where you cannot impose a legal obligation you yourself wouldn't endure
Source
Immanuel Kant (Perpetual Peace [1795], 2.1st n)
Book Reference
Kant,Immanuel: 'Political Writings', ed/tr. Reiss,Hans [CUP 1996], p.99
A Reaction
This appears only to be legal equality, rather than political or economic or social equality.