According to the proverb, it’s curiosity. Or care, if you choose to quote Shakespeare.
I might have got this proverb totally wrong, but here we go.
If curiosity killed the cat, we must all get rid of our dangerous curiosity. It’s the killer within.
I remember telling a friend I thought she was naturally curious. I ment that as a compliment. She thought I ment she was nosy. I had to really, really convince her that I ment that curiosity is what brings the world forward. If noone was curious, nothing would be different. And we would certainly not have the technology that makes me spread my thoughts worldwide.
I don’t think curiosity killed the cat. Maybe a badger, or a car. Or tapeworm or cancer.
As for the tapeworm and cancer, maybe even curiosity saved the cat!