Verse 42:23 and how to interpret it, disciplines of interpreting Quran.

[Mystic]

As far Muslims go, the same way Bani-Isreal became blind in their trials when they thought there would be no trial.  And God turn to many of them mercifully, but again, they became blind.

How did they become blind?

Who cares; troll?

First, everything in Quran is already of dire importance for humanity to heed.
Second, something repeated and emphasized in Quran is of dire importance for humanity to heed for sure, even if you belittle some verses over others like a clown who thinks he knows everything there is to know about God's book.
Bani-Israel and how they got misguided is of the most emphasized themes to the extent there is a verse that says that the Quran discusses and iterates most of what Bani-Israel differed in and disputed about.