77. People of the world may be inclined to think that it is Christianity which may ultimately spread throughout the world, or it may be Buddhism which will prevail in the end. But they are certainly wrong in these conjectures. Remember that nothing happens on this Earth unless it has been so willed in Heaven. And, it is the God of Heaven who revealed to me that ultimately it will be the religion of Islam which will conquer the hearts of people.
(Braheen-e-Ahmadiyya, Pt. 5: Roohani Khaza'in Vol. 21, p 427)