MuU 1.2.8
अविद्यायामन्तरे वर्तमानाः स्वयं धीराः पण्डितं मन्यमानाः । जङ्घन्यमानाः परियन्ति मूढा अन्धेनैव नीयमाना यथान्धाः
avidyāyāmantare vartamānāḥ svayaṃ dhīrāḥ paṇḍitaṃ manyamānāḥ | jaṅghanyamānāḥ pariyanti mūḍhā andhenaiva nīyamānā yathāndhāḥ
Sanskrit for this text is pending; the English follows the translator's numbering.
Fools dwelling in darkness, wise in their own conceit, and puffed up with vain knowledge, go round and round staggering to and fro, like blind men led by the blind.
Translated by F. Max Müller