喉もと過ぎれば熱さを忘れる

(のどもとすぎればあつさをわすれる)

Japanese meaning

つらいことや苦しいこと、受けた恩などは、苦しい時がすぎると、忘れてしまうことのたとえ。

English meaning

People tend to forget the hardships or favours once they are over or received.

Literal English translation

Once past the throat, the heat is forgotten.