泥棒を防ぐもの自身が大泥棒

Reading
どろぼうをふせぐものじじんがおおどろぼう
English
One who guards against a thief may be a bigger thief
Notes
One who guards防 against a thief泥棒 may themselves自身 be a bigger大 thief泥棒
Origin
ハンガリー
proverbsKotoKen 2