Sri Velukkudi Krishnan Swami
(Alternate version from vedics.net)
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Ramanuja's 18 trips to Thirukkottiyur to gain the inner meanings of the Rahasyas from Thirukottiyur Nambi, is well known. Even though Thirukottiyur Nambi sent back Ramanuja each time without giving him the meanings that he seeked, he did not send him back empty handed. Nambi taught him a sampradhaya rahasya each time. Sri Velukkudi Krishnan Swami in his inimitable style delivers an outstanding upanyasam on the eighteen rahasyas taught by Nambi to Ramanuja and the subtle meanings within each of them.