Be careful what you wish for
Meaning
Desires may produce unwanted consequences.
Usage
Used as a caution when pursuing goals too hastily.
Origin & History
Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.
Roots in fairy tales where wishes backfired.
A proverb tracing back to early European stories about moral lessons.