おんこちしん
developing new ideas based on study of the past; learning from the past
Also written 温古知新
Noun
温故知新おんこちしんというからねえ。歴史れきしの勉強べんきょうは大切たいせつだよ。
They say you should consult the past if you want to learn about the future. History has a lot to teach us.