Any person who desires the fruits of the four principles religiosity, economic development, sense gratification and, at the end, liberation, should engage himself in the devotional service of the Supreme Personality of Godhead, for worship of His lotus feet yields the fulfillment of all of these.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
धर्मार्थकाममोक्षाख्यं य इच्छेच्छ्रेय आत्मनः । एकमेव हरेस्तत्र कारणं पादसेवनम्
dharmārthakāmamokṣākhyaṃ ya icchecchreya ātmanaḥ | ekameva harestatra kāraṇaṃ pādasevanam
SB 4.8.41