O King, constant chanting of the holy name of the Lord after the ways of the great authorities is the doubtless and fearless way of success for all, including those who are free from all material desires, those who are desirous of all material enjoyment, and also those who are self-satisfied by dint of transcendental knowledge.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
एतन्निर्विद्यमानानामिच्छतामकुतोभयम् । योगिनां नृप निर्णीतं हरेर्नामानुकीर्तनम्
etannirvidyamānānāmicchatāmakutobhayam | yogināṃ nṛpa nirṇītaṃ harernāmānukīrtanam
SB 2.1.11