"Curiosity killed the cat" is a proverb used to warn of the dangers of unnecessary investigation or experimentation. A less frequently-seen rejoinder to "curiosity killed the cat" is "but, satisfaction brought it back".
"In my house lives a cat who is a curmudgeon and cantankerous, a cat who is charming and convivial, and a cat who is combative and commendable. And yet I have but one cat."