pure devotional service is guareented , and at the end he will come back to me (KRISHNA) Posted on September 13, 2015September 15, 2015 by Guruprasad Srinivasan For one who explains this supreme secret to the devotees ,PURE DEVOTIONAL SERVICE IS GUAREENTED , AND AT THE END HE WILL COME BACK TO ME . BAGAVAD GITA CHAPTER 18 , VERSE 68 .