SB 11.14.20: My dear Uddhava, the unalloyed devotional service rendered to Me by My devotees brings Me under their control. I cannot be thus controlled by those engaged in mystic yoga, Sāńkhya philosophy, pious work, Vedic study, austerity or renunciation.

SB 11.14.21: Only by practicing unalloyed devotional service with full faith in Me can one obtain Me, the Supreme Personality of Godhead. I am naturally dear to My devotees, who take Me as the only goal of their loving service. By engaging in such pure devotional service, even the dog-eaters can purify themselves from the contamination of their low birth.

SB 11.14.22: Neither religious activities endowed with honesty and mercy nor knowledge obtained with great penance can completely purify one's consciousness if they are bereft of loving service to Me.