to be vigilant
しゅじゅつは ぶじ おわりましたが、ゆだんは きんもつですよ。
The surgery was a success but you have to be vigilant.
you are what you eat
The common cold can develop into all kinds of illness.
Home is where you make it. (a Japanese proverb which means wherever you live, once you get used to living there, it becomes home)