The writing of Vaisnava literatures is not a function for ordinary men. Vaisnava literatures are not mental concoctions. They are all authorized literature meant to guide those who are going to be Vaisnavas. Under these circumstances, an ordinary man cannot give his own opinion. His opinion must always correspond with the conclusion of the Vedas. Unless one is fully qualified in Vaisnava behavior and authorized by superior authority (the Supreme Personality of Godhead), one cannot write Vaisnava literatures or purports and commentaries on Srimad-Bhagavatam and Bhagavad-gita.