(be|) careful what you wish for
1
used to warn people to think carefully about their desires, as the things they wish for may have unforeseen and unintended consequences
The origin of the proverb "be careful what you wish for" can be traced to English-speaking cultures. It reflects the idea that people may not fully understand the implications of their wishes, and what seems like a good outcome may lead to unforeseen problems. The proverb serves as a reminder to carefully consider the potential consequences of one's desires and decisions before pursuing them.
- John had always wished for a big promotion, but when he finally got it, he realized the stress and responsibility that came with it.Be careful what you wish for, I suppose.