Curiosity killed the cat is the warning that asking too much can get you in trouble. They say curiosity killed the cat, remember that curiosity killed the cat, well, curiosity killed the cat.
The reply, that satisfaction brought it back, was added later and turns the warning on its head. An older version said care killed the cat, with care meaning worry rather than caution.
1phrasecuriosity killed the catThe warning that asking too much can get you in trouble.
“When I asked what was in the parcel, Gran just winked and said curiosity killed the cat.”
curiosity killed the cat is a warning.
From an older saying that care killed the cat, with care meaning worry; the curiosity version is later.
Compare earlier care killed the cat. Referring to the statement that it will kill anyone, even though they had, like the proverbial cat, nine lives.
Etymology from Wiktionary, CC BY-SA
Practised in Idioms