Consider the human 'Self, and how it is capable for being balanced out.
فَأَلْهَمَهَا فُجُورَهَا وَتَقْوَاهَا ( 8 )
And how it is instilled with the capacity to disintegrate or become secure.
قَدْ أَفْلَحَ مَن زَكَّاهَا ( 9 )
Successful indeed is he who grows the 'Self'.
وَقَدْ خَابَ مَن دَسَّاهَا ( 10 )
And failure is indeed he who keeps it buried (under ignorance and superstition).
كَذَّبَتْ ثَمُودُ بِطَغْوَاهَا ( 11 )
(Disregarding this principle) Thamud rejected (Saleh) while playing God. ('Tagha' = Being 'Taghut' = Becoming a false god = Playing God = Transgressing = Rebelling = Crossing bounds of decency = Extreme arrogance).
إِذِ انبَعَثَ أَشْقَاهَا ( 12 )
Behold, the most forward among them was picked up for defiance.