Pure devotional service rendered to the Supreme Lord is spiritually so potent that simply by hearing about such transcendental service, by chanting its glories in response, by meditating on it, by respectfully and faithfully accepting it, or by praising the devotional service of others, even persons who hate the demigods and all other living beings can be immediately purified.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
श्रुतोऽनुपठितो ध्यात आदृतो वानुमोदितः । सद्यः पुनाति सद्धर्मो देवविश्वद्रुहोऽपि हि
śruto'nupaṭhito dhyāta ādṛto vānumoditaḥ | sadyaḥ punāti saddharmo devaviśvadruho'pi hi
SB 11.2.12