In Eden, his argument was that each individual can and should decide what is good and what is bad, doing so independent of God.
فَفِي جَنَّةِ عَدْنٍ ،‏ ٱدَّعَى أَنَّ كُلَّ شَخْصٍ فِي وِسْعِهِ وَمِنْ حَقِّهِ أَنْ يُقَرِّرَ لِنَفْسِهِ مَا هُوَ خَيْرٌ وَمَا هُوَ شَرٌّ بِٱسْتِقْلَالٍ عَنِ ٱللهِ .‏