Faithful and unfaithful believers
Nahj al-Balāgha|Volume 1|Book 1|Chapter 87
قَدْ أَلْزَمَ نَفْسَهُ الْعَدْلَ، كَانَ أَوَّلَ عَدْلِهِ نَفْيُ الْهَوَى عَنْ نَفْسِهِ، يَصِفُ الْحَقَّ وَيَعْمَلُ بِهِ، لاَ يَدَعُ لِلْخَيْرِ غَايَةً إِلاَّ أَمَّهَا وَلاَ مَظِنَّةً إِلاَّ قَصَدَهَا، قَدْ أَمْكَنَ الْكِتَابَ مِنْ زِمَامِهِ فَهُوَ قَائِدُهُ وَإِمَامُهُ، يَحُلُّ حَيْثُ حَلَّ ثَقَلُهُ وَيَنْزِلُ حَيْثُ كَانَ مَنْزِلُهُ.
He has enjoined upon himself (to follow) justice. The first step of his justice is the rejection of desires from his heart. He describes right and acts according to it. There is no good which he has not aimed at nor any likely place (of virtue) of the Qurā'n. Therefore the Qur’ān is his guide and leader. He gets down when the Qur’ān puts down his weight and he settles where the Qur’ān settles him down.