My dear King, the devotee who worships the lotus feet of the infallible Personality of Godhead with constant endeavor thus achieves unflinching devotion, detachment and experienced knowledge of the Personality of Godhead. In this way the successful devotee of the Lord achieves supreme spiritual peace.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
इत्यच्युताङ्घ्रिं भजतोऽनुवृत्त्या भक्तिर्विरक्तिर्भगवत्प्रबोधः । भवन्ति वै भागवतस्य राजं- स्ततः परां शान्तिमुपैति साक्षात्
ityacyutāṅghriṃ bhajato'nuvṛttyā bhaktirviraktirbhagavatprabodhaḥ | bhavanti vai bhāgavatasya rājaṃ- stataḥ parāṃ śāntimupaiti sākṣāt
SB 11.2.43