paragraph 201 in volume 2, chapter 12, The Compulsory Jurisdiction (Optional Clause)
Having regard for Article 2, paragraph 7, of the Charter, applicable to the Court in its capacity of a principal organ of the United Nations, it could be said that the Court has no jurisdiction to intervene in matters which are essentially within the domestic jurisdiction of any State. However, States have shown hesitation in relying only on that provision, and many declarations contain a reservation to the…