Suppose someone advises everyone to help neighbors in distress. When a neighbor actually needs help, that person has the means but does nothing.
This illustrates wa-amkanaka an tuwāsiya fa-mā āsayta: an opportunity was available but not taken.
Someone else denounces oppression but violates the rights of others in dealings. That more closely illustrates wa-tazjuru ʿani al-ẓulmi thumma taghshāhu. The first concerns opportunity versus action; the second, professed principle versus conduct.