महाभारत - अवलिप्त गुरु

गुरोरप्यवलिप्तस्य कार्याकार्यमजानतः ।
उत्पथं प्रतिपन्नस्य कार्यं भवति शासनम् ॥

- महाभारत

guroH api avaliptasya kArayam akArayam ajAnataH ।
utpathaM pratipannasya kAryam bhavati shAsanam ॥

- mahAbhArata

When a person strays from the right path and loses the distinction between right and wrong, we have the duty to correct him even when he is our teacher.

- Mahabharata