温故知新 (wēn gù zhī xīn): to review the old and know the new (idiom, from the Analects); to recall the past to understand the future
温故知新
to review the old and know the new (idiom, from the Analects); to recall the past to understand the future
From the Analects: warm up the old and you will come to know the new. Japanese borrowed the same four characters and the same advice, which is a pleasant thing to notice while revising.
The same saying in Japanese: 温故知新