quit while you're ahead
Meaning: This phrase can be used to express the idea that one should stop doing something that's rewarding but risky before something bad happens.
- Michael Schumacher got a lot out of car racing, and he was smart enough to quit while he was ahead.
- You've already made a good profit from the share market, so why don't you sell your shares and quit while you're ahead.
We went to a casino and Carla won a hundred dollars. Then she quit while she was ahead because she didn't want to