Escalating signs as a call to repentance

وَمَا نُرِيهِم مِّنْ ءَايَةٍ إِلَّا هِىَ أَكْبَرُ مِنْ أُخْتِهَا ۖ وَأَخَذْنَـٰهُم بِٱلْعَذَابِ لَعَلَّهُمْ يَرْجِعُونَ

And We showed them not a sign except that it was greater than its sister, and We seized them with affliction that perhaps they might return [to faith].