Full Idea
Leibniz's Law is an essentialist truth.
Gist of Idea
Leibniz's Law is an essentialist truth
Source
David S. Oderberg (Real Essentialism [2007], 1.1)
Book Reference
Oderberg,David S.: 'Real Essentialism' [Routledge 2009], p.5
A Reaction
That is, if two things must have identical properties because they are the same thing, this is because those properties are essential to the thing. Otherwise two things could be the same, even though one of them lacked a non-identifying property.