One who constantly hears and chants the holy name of the Lord and hears and chants about His activities can very easily attain the platform of pure devotional service, which can cleanse the dirt from one’s heart. One cannot achieve such purification merely by observing vows and performing Vedic ritualistic ceremonies.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
शृण्वतां गृणतां वीर्याण्युद्दामानि हरेर्मुहुः । यथा सुजातया भक्त्या शुद्ध्येन्नात्मा व्रतादिभिः
śṛṇvatāṃ gṛṇatāṃ vīryāṇyuddāmāni harermuhuḥ | yathā sujātayā bhaktyā śuddhyennātmā vratādibhiḥ
SB 6.3.32