Sree Sree Guru Gaurangau Jayatah!
In the Gita Sri Krishna has advised to those who worship the Supreme Lord with one-pointed devotion that God will bestow on them that sort of wisdom to understand what is good and what is bad, and they can achieve the Ultimate Blissful Transcendental Realm. He also said, 'A sincere soul will never be deceived.' The criterion to understand what we are to do and what we are not to do is given by Vedavyasa Muni himself in Padma Purana: we are to always remember Krishna, and never to forget Him. There are some prescribed devotional practices to remember Krishna and there are also some prohibitions against those that make us forget Krishna. If there be any action beyond the prescribed commandments which will remind you of Krishna, it is allowed, and actions which will make you forget Krishna are prohibited. Without sharanagati, there cannot be any bhakti.
--- Jagad-guru His Divine Grace Srila Bhakti Ballabh Tirtha Goswami Maharaj