A proverb meaning that painful or dangerous experiences are often forgotten once they have passed; people tend to forget past hardships or warnings.
彼は以前大けがをしたのに、喉元過ぎれば熱さを忘れるでまた無茶をしている。
He was badly injured before, but now that it's past he has forgotten the danger and is being reckless again.
『喉元過ぎれば熱さを忘れる』と言うけれど、あの失敗から学んだことは忘れないでほしい。
They say 'once it's past the throat you forget the heat', but I hope you don't forget what you learned from that mistake.
戦争を経験した世代の話を聞くと、喉元過ぎれば熱さを忘れるのが怖いと思う。
Hearing stories from the generation that experienced war, I feel afraid that once it's over people will forget the hardship.