Foundation of his building on piety to Allah

 أَفَمَنْ أَسَّسَ بُنْيَـٰنَهُۥ عَلَىٰ تَقْوَىٰ مِنَ ٱللَّهِ وَرِضْوَٰنٍ خَيْرٌ أَم مَّنْ أَسَّسَ بُنْيَـٰنَهُۥ عَلَىٰ شَفَا جُرُفٍ هَارٍۢ فَٱنْهَارَ بِهِۦ فِى نَارِ جَهَنَّمَ ۗ وَٱللَّهُ لَا يَهْدِى ٱلْقَوْمَ ٱلظَّـٰلِمِينَ ١٠٩

Is it then he who laid the foundation of his building on piety to Allah and His Good Pleasure better, or he who laid the foundation of his building on the brink of an undetermined precipice ready to crumble down, so that it crumbled to pieces with him into the Fire of Hell. And Allah guides not the people who are the Zalimun (cruel, violent, proud, polytheist and wrong-doer).

Quran 9:109