it's easy to be wise after the event

it's easy to be wise after the event

It is far easier to understand how something bad could have been prevented after it has already occurred. I never would have bought this car if I had known it needed so much work done to it. Well, it's easier to be wise after the event.
See also: after, easy, event, wise

be wise after the event

If you say that someone is wise after the event, you mean that they understand a situation and know how to deal with it, but only because it has already happened. I still feel I should have done more to try and stop him getting into the car, but it's easy to be wise after the event.
See also: after, event, wise