Bhagavad Gita Chapter 3, Verse 32
ये त्वेतदभ्यसूयन्तो नानुतिष्ठन्ति मे मतम् | सर्वज्ञानविमूढांस्तान्विद्धि नष्टानचेतसः ||
ye tv etad abhyasūyanto nānutiṣṭhanti me matam sarva-jñāna-vimūḍhāṁs tān viddhi naṣṭān acetasaḥ
But those who criticize and do not follow this teaching of Mine, deluded about all knowledge, know them to be lost and devoid of discrimination.
After verse 3.31's promise of freedom to faithful practitioners, Krishna warns of the opposite path: those who criticize without trying—'abhyasūyantaḥ' (finding fault) yet 'nānutiṣṭhanti' (don't practice). They become 'sarva-jñāna-vimūḍhān'—deluded about all knowledge, thinking they're wise when they're actually confused because they never engaged. 'Naṣṭān acetasaḥ'—lost and without discrimination. Acetasaḥ means unable to discern truth. The teaching is sharp: sideline criticism without practice equals delusion and lostness.