Srila Bhaktisiddhanta Sarasvati Thakura says that if something impedes the execution of devotional service, it should be understood to be impure. Pure devotees of the Lord do not accept impure principles. Impure devotees accept rasabhasa, or overlapping, contradictory mellows, and other principles opposed to the bhakti path. The followers of such impure principles are never accepted as pure devotees. There are many parties following the path of rasabhasa, and the followers are sometimes adored by ordinary men. Those who adopt the conclusions of rasabhasa and bhakti-siddhanta-viruddha are never accepted as devotees of Sri Caitanya Mahaprabhu. Svarupa Damodara Gosvami never approved such followers as Gaudiya Vaisnavas, nor did he allow them even to meet the Supreme Lord, Sri Caitanya Mahaprabhu.