नारुंतुदः स्यादार्तोऽपि न परद्रोहकर्मधीः |
यथाऽस्योद्विजते वाचा नालोक्यां तामुदीरयेत् ||
- मनु स्मृति
One must not speak harshly to any one even when he is in misery himself. Even in one's mind he must not think about hurting others. One must not speak in a way that will be perceived by most as inappropriate (or against prevailing norms).
- Manu Smriti