Phil Dreizen

Curiosity killed the cat, but satisfaction brought her back.

Update:I should fill this in a bit. I had been told erroneously, by a friend, that the original expression had always been "Curiosity killed the cat, but satisfaction brought her back" and that the second part was eventually dropped. But it seems to be the case that the "satisfaction brought her back" part is much newer than the more commonly known first part. The etymology of the phrase is that it began as something like "Care killed the cat" in Elizabethan english, where "care" means something like "worry" and changed into "Curiosity" later. The "satisfaction brought her back" is more recent - dating at least as far back as the 1930s.

The meaning and origin of the expression: Curiosity killed the cat