Kaṭha Upaniṣad 83

83

ye tu saṃsārabhājo janā avidyāyām antare madhye ghanībhūta iva tamasi vartamānā veṣṭyamānāḥ putrapaśvāditṛṣṇāpāśaśataiḥ, svayaṃ dhīrāḥ prajñāvantaḥ paṇḍitāḥ śāstrakuśalaś ceti manyamānās te dandramyamāṇā atyarthaṃ kuṭilām anekarūpāṃ gatiṃ gacchanto jarāmaraṇarogādiduḥkhaiḥ pariyanti parigacchanti mūḍhā avivekino 'ndhenaiva dṛṣṭivihīnenaiva nīyamānā viṣame pathi yathā bahavondhā mahāntam anartham ṛcchanti tadvat ///1,2.5 //

Shankara’s Commentary:
Com.—But those men living in Samsara in the midst of ignorance as in thick darkness, entangled in a hundred meshes formed by attachment for sons, cattle and the rest, regarding themselves as intelligent and well-versed in the Sastras, go round and round, get into many crooked ways afflicted with miseries such as old age, death, disease, etc., devoid of discernment, just as the blind led by the blind in uneven paths come to great grief.