Hearing and chanting about the transcendental holy name, form, qualities, paraphernalia and pastimes of Lord Visnu, remembering them, serving the lotus feet of the Lord, offering the Lord respectful worship, offering prayers to the Lord, becoming His servant, considering the Lord ones best friend, and surrendering everything unto Himthese nine processes are accepted as pure devotional service. (Bhag. 7.5.23) sravanam kirtanam, hearing and chanting, are especially important. By hearing from her husband about the greatness of Lord Vasudeva, Devayani certainly became convinced and surrendered herself unto the lotus feet of the Lord (om namo bhagavate vasudevaya). This is knowledge. Bahunam janmanam ante jnanavan mam prapadyate [Bg. 7.19]. Surrender to Vasudeva is the result of hearing about Him for many, many births. As soon as one surrenders unto Vasudeva, one is liberated immediately. Because of her association with her great husband, Maharaja Yayati, Devayani became purified, adopted the means of bhakti-yoga, and thus became liberated.