Regarding utilizing intelligence in devotional service, intelligence should be confirmed by the Spiritual Master. Therefore we accept the Spiritual Master for guidance. You should not depend on your own intelligence. Just like a child requires a parent to tell him THE CORRECT thing to do, similarly, a strict disciple should ALWAYS USE his intelligence in conformity with the instructions of the Spiritual Master.
(Srila Prabhupada's letter to: Sivananda—Los Angeles 13 February, 1969)
NOTE: How can your intelligence be confirmed by a bogus guru and Bona Fide Spiritual Master?