Denshi Jisho — Online Japanese dictionary

Found 4 sentences.

愚者あと知恵 It is easy to be wise after the event.
愚者すぐ奥の手出し行き詰まる A fool's bolt is soon shot.
君子恐れて踏み込まぬ愚者突入する Fools rush in where angels fear to tread.
泣いたない若者野蛮人であり笑おうない老人愚者である。 The young man who has not wept is a savage, and the old man who will not laugh is a fool.