ignorance is bliss
Meaning: You can say "ignorance is bliss" when you want to say that not knowing about something unpleasant can be better than knowing about it and worrying about it.
- What's the point in knowing about all these problems if we can't do anything about them? Sometimes ignorance is bliss, you know.
- I didn't go to the doctor at first because I was thinking ignorance is bliss. But now I wish I'd gone and had some treatment, of course.