(Say: “Your Lord is the Owner of vast mercy…”) encouraging them to seek Allah’s vast mercy and follow His Messenger ,
(and never will His wrath be turned back from the people who are criminals.) discouraging them from defying the Messenger, the Final Prophet, Muhammad . Allah often joins encouragement with threats in the Qur’an. Allah said at the end of this Surah:
(Surely, your Lord is swift in retribution, and certainly He is Oft-Forgiving, Most Merciful.) 6:165 Allah also said,
(But verily, your Lord is full of forgiveness for mankind in spite of their wrongdoing. And verily, your Lord is (also) severe in punishment.) 13:6, and
(Declare unto My servants, that truly, I am the Oft-Forgiving, the Most Merciful. And that My torment is indeed the most painful torment.) 15:49-50, and
(The Forgiver of sin, the Acceptor of repentance, the Severe in punishment.) 40:3 and,
(Verily, the punishment of your Lord is severe and painful. Verily, He it is Who begins and repeats. And He is Oft-Forgiving, full of love.)85:12-14. There are many other Ayat on this subject.