Full Idea
Various writers have noted that the Identity of Indiscernibles is really tantamount to the verification principle.
Gist of Idea
The Identity of Indiscernibles is really the same as the verification principle
Source
Nicholas Jolley (Leibniz [2005], Ch.3)
Book Reference
Jolley,Nicholas: 'Leibniz' [Routledge 2005], p.85
A Reaction
Both principles are false, because they are the classic confusion of epistemology and ontology. The fact that you cannot 'discern' a difference between two things doesn't mean that there is no difference. Things beyond verification can still be discussed.