See sense
Definition 1 of 1
Pro Tip 1/3Idiomatic Usage
Used in casual conversation, often to suggest improvement or change in someone's decision or behavior. 
After much debate, he finally saw sense and canceled the risky investment.
Pro Tip 2/3Positive Change
Implies a change towards better judgement or more rational thinking. 
She saw sense after reviewing the facts and apologized.
Pro Tip 3/3Slight Criticism
Carries a mild critical tone, suggesting previous foolishness or error. 
I hope he sees sense soon and stops wasting his time on impractical ideas.