Idioms: see eye to eye, see the light, see the error of one's ways

Let's look at some more 'seeing' idioms.

If you see eye to eye (or eye-to-eye) with someone, you agree with them. You have an understanding, a similar way of thinking.

I never saw eye to eye with my mother-in-law.

If you see the light, it means you suddenly realise something, and change your thinking. It suggests that before, you were deceived or ignorant - now you know the truth.

He used to think studying English was a waste of time. But now he's seen the light, and he studies ten hours a week.

There is a similar expression, see the error of one's ways, which means to realise your mistakes and change your thinking/behaviour.

He used to stay out until 3am every night. But now he's seen the error of his ways and he goes to bed early.

How about you? Who do you see eye-to-eye with? Is there a time when you saw the light and changed your old idea/dislike of something?