Srimad Bhagavatam

References to text SB 10.2.32
SB 10.2.32: [Someone may say that aside from devotees, who always seek shelter at the Lord’s lotus feet, there are those who are not devotees but who have accepted different processes for attaining salvation. What happens to them? In answer to this question, Lord BrahmÄ and the other demigods said:] O lotus-eyed Lord, although nondevotees who accept severe austerities and penances to achieve the highest position may think themselves liberated, their intelligence is impure. They fall down from their position of imagined superiority because they have no regard for Your lotus feet.

Text â„–
Devotional service manifests as the most elevated, pure love for God.
Narada Bhakti Sutra
NBS 2
Pure devotional service, on the other hand, is far superior to fruitive work, philosophical speculation, and mystic meditation.
Narada Bhakti Sutra
NBS 25
Therefore seekers of liberation should take to devotional service alone.
Narada Bhakti Sutra
NBS 33