Persons who are strongly entrapped by the consciousness of enjoying material life, and who have therefore accepted as their leader or guru a similar blind man attached to external sense objects, cannot understand that the goal of life is to return home, back to Godhead, and engage in the service of Lord Viṣṇu. As blind men guided by another blind man miss the right path and fall into a ditch, materially attached men led by another materially attached man are bound by the ropes of fruitive labor, which are made of very strong cords, and they continue again and again in materialistic life, suffering the threefold miseries.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
न ते विदुः स्वार्थगतिं हि विष्णुं दुराशया ये बहिरर्थमानिनः । अन्धा यथान्धैरुपनीयमाना वाचीशतन्त्यामुरुदाम्नि बद्धाः
na te viduḥ svārthagatiṃ hi viṣṇuṃ durāśayā ye bahirarthamāninaḥ | andhā yathāndhairupanīyamānā vācīśatantyāmurudāmni baddhāḥ
SB 7.5.31