Srila Bhaktsiddhanta Sarasvati Thakur is the spiritual master of His Divine Grace A.C. Bhaktivedanta Swami Prabhupada. It was Bhaktsiddhanta's powerful preaching that reestablished the pure teachings of Krishna in India and who selected Srila Prabhupada to spread Lord Caitanya's Sankirtan movement all over the world. Bhaktsiddhanta very much liked the printing press which he called the brhad-mrdanga. The greater mrdanga. He said that the mrdanga can be heard for a block or so, but the printing press can be heard all over the world. So he instructed Srila Prabhupada to write books on the science of Krishna consciousness and distribute them all over the world. A task that Srila Prabhupada has performed wonderfully.