Srila Bhaktivedanta Narayana Maharaja has said that 
his Guru Maharaja took sannyasa from Parama-pujapada Srila Sridhara Maharaja. Even though Srila Sridhara Maharaja joined the mission of their Gurudeva after him, he was an elevated philosopher and a knower of the established truths of bhakti, and his very name, Bhakti Raksaka, means “protector of devotion”. He has also extensively glorified our Gurudeva. To teach other devotees, they used to hold meetings and defeat each others arguments in philosophy. Parama-pujapada Srila Sridhara Maharaja would establish one thing and Guru Maharaja would defeat all his arguments, and then at the next moment Srila Sridhara Maharaja would defeat all the arguments of our Gurudeva. The entire audience would hear them, enjoy their discussions, and in this way learn so much philosophy.
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his Guru Maharaja took sannyasa from Parama-pujapada Srila Sridhara Maharaja. Even though Srila Sridhara Maharaja joined the mission of their Gurudeva after him, he was an elevated philosopher and a knower of the established truths of bhakti, and his very name, Bhakti Raksaka, means “protector of devotion”. He has also extensively glorified our Gurudeva. To teach other devotees, they used to hold meetings and defeat each others arguments in philosophy. Parama-pujapada Srila Sridhara Maharaja would establish one thing and Guru Maharaja would defeat all his arguments, and then at the next moment Srila Sridhara Maharaja would defeat all the arguments of our Gurudeva. The entire audience would hear them, enjoy their discussions, and in this way learn so much philosophy...........................................................................
The picture above is that of Srila Bhakti Prajnana Keshava Maharaj
