Revelation of sin

When Ezra is told of the people's sin of marrying the neighbouring countries women, he takes it quite hard.

And I sat there appalled until the evening sacrifice. Ezra 9:4

Then he begins prayer and petitioning and Israel works out a way to make it right.
What I thought was interesting about this whole episode is that Ezra is truly blindsided by the facts that are told to him, but this marrying was not a sudden happening. There were lots of men who had done this, with children being born from the unions. That takes time, that isn't instantaneous. So either he was off doing other things and he wasn't really in tune with the people or he knew about it, but didn't understand the impact of it.
Sometimes we have sin in our lives that we allow to continue on because either we ignore it, or we don't understand the impact of it.
Lord, open our eyes to our sin, so we can repent, and move on with our life in you.