Four pillars of faith and unbelief
Nahj al-Balāgha|Volume 1|Book 3|Chapter 31
وَالْكُفْرُ عَلَى أَرْبَعِ دَعَائِمَ: عَلَى التَّعَمُّقِ وَالتَّنَازُعِ وَالزَّيْغِ وَالشِّقَاقِ فَمَنْ تَعَمَّقَ لَمْ يُنِبْ إِلَى الْحَقِّ، وَمَنْ كَثُرَ نِزَاعُهُ بِالْجَهْلِ دَامَ عَمَاهُ عَنِ الْحَقِّ، وَمَنْ زَاغَ سَاءَتْ عِنْدَهُ الْحَسَنَةُ وَحَسُنَتْ عِنْدَهُ السَّيِّئَةُ وَسَكِرَ سُكْرَ الضَّلاَلَةِ، وَمَنْ شَاقَّ وَعُرَتْ عَلَيْهِ طُرُقُهُ وَأَعْضَلَ عَلَيْهِ أَمْرُهُ وَضَاقَ عَلَيْهِ مَخْرَجُهُ.
Unbelief stands on four supports: hankering after whims, mutual quarrelling, deviation from the truth, and dissension. So, whoever hankers after whims does not incline towards right: whoever quarrels much on account of ignorance remains permanently blinded from the right; whoever deviates from truth, for him good becomes evil and evil becomes good and he remains intoxicated with misguidance; and whoever makes a breach (with Allāh and His Messenger), his path becomes difficult, his affairs become complicated and his way of escape becomes narrow.