You don't keep throwing your net where there aren't any fish.
5 seconds sound clip from the Cloudy with a Chance of Meatballs movie soundboard.
You can hear this line at 00:08:08 in the Blu-ray version of the movie.
Quote context
[...]
- Don't you think it's time to give up this inventing thing, get a real job?
- No, why?
- Well, all your technology stuff, it just ends in disaster.
- You don't keep throwing your net where there aren't any fish.
- What?
- I want you to work full-time at the tackle shop.
- The tackle shop? Oh, Dad, no.
[...]