Divine mercy and divine punishment as complementary attributes

مَّا يُقَالُ لَكَ إِلَّا مَا قَدْ قِيلَ لِلرُّسُلِ مِن قَبْلِكَ ۚ إِنَّ رَبَّكَ لَذُو مَغْفِرَةٍ وَذُو عِقَابٍ أَلِيمٍ

Nothing is said to you, [O Muḥammad], except what was already said to the messengers before you. Indeed, your Lord is a possessor of forgiveness and a possessor of painful penalty.