महाभारत - वन

नित्यं क्रोधात्तपो रक्षेत् धर्मं रक्षेच्च मत्सरात् |
विद्यां मानापमानाभ्यामात्मानं तु प्रमादतः ||

- महाभारत, वन

At all times, one must protect his penance from anger, morality from jealousy, knowledge from emotions (reactions to praise or ridicule), one self from madness.

- Mahabharata, Vana