Imam Ali (AS) said, Showing compassion to one who does not show compassion [to others] prevents [divine] mercy, and sparing one who does not spare others destroys the nation.
الإمامُ عليٌّ (عَلَيهِ الّسَلامُ) : رَحْمَةُ مَنْ لا يَرْحَمُ تَمْنَعُ الرَّحْمَةَ وَ اسْتِبْقاءُ مَنْ لا يُبْقي يُهْلِكُ الاُمَّةَ