bù​dāng​jiā​bù​zhī​chái​mǐ​guì

you don't know the cost of living until you run a household

不当家不知柴米贵 不當家不知柴米貴 bù​dāng​jiā​bù​zhī​chái​mǐ​guì
you don't know the cost of living until you run a household
a person who does not manage a household would not be aware of how expensive it is to live; often used to remind someone to be less wasteful or more appreciative of resources