The Proof Based on Establishment (Dalí-i-Taqrír) and the Proof Based on Verses (Hujjiyyat-i-Ayát) : An Introduction to Bahá'í-Muslim Apologetics 

<br/><br/> Apologetics in Iran, especially as developed by Gulpáygání, used two closely related proofs: the proof of a religion's divine origin based upon its establishment (only religions revealed by God survive and succeed); and the proof of its truth based upon the revelation of verses.  The proof based on establishment is introduced into the Christian context.