Hindsight's 20/20 American proverb sentence
The word "Hindsight" means understanding after something has happened. 20/20 is a term in ophthalmology to mean good vision.
The phrase implies that looking back on what happened is easy for someone to understand.
Hindsight is 20/20. I should have listened to your advice.
We have realized his decision brought the company many problems, but hindsight's 20/20.
The phrase appeared in the 1900s.
If you fall for someone's trick the first time then they are at fault.
Are you going to mess with me again? Fool me once, shame on you; fool me twice, shame on me.