Imam Ali (AS) said, Your best action is that by which you improve your day [of reckoning] and the worst [of your actions] is that by which you corrupt your community.
الإمامُ عليٌّ (عَلَيهِ الّسَلامُ) : خَيْرُ عَمَلِكَ ما أصْلَحْتَ بِهِ يَوْمَكَ وَ شَرُّهُ ما أفْسَدْتَ (اِسْتَفْسَدْتَ) بِهِ قَوْمَكَ