فَأَلْهَمَهَا فُجُورَهَا وَتَقْوَاهَا
Then He inspired it with knowledge of its wickedness and its piety. (91:8)
The prefixed fā links the soul's fashioning to its moral awareness. Fujūrahā wa-taqwāhā sets up an opposition: two contrary moral directions are placed before the human being.
This is not a decorative antithesis alone. It prepares the later contrast between purification and corruption. The rhetorical force depends on the argument's progression as well as the lexical opposition.