Srila Bhaktisiddhanta Sarasvati Thakur Prabhupada was a prolific writer and speaker, he published his father´s writings and he wrote himself commentaries on many scriptures.
When he went to East Bengal, he gave realizations to the inquiring public that were beyond their dreams. For example, Srila Prabhupada resided in the city of Dacca for one month and gave thirty different interpretations of the first verse of the Srimad Bhagavatam 1.1.1
Great scholars were amazed to hear these interpretations. At that time many sincere souls took initiation from Srila Prabhupada.