蛇じゃの道みちは蛇へび

expression

it takes one to know one; a thief knows a thief; the wolf knows what the ill beast thinks

Proverb meaning that people of the same kind, especially those with similar vices or expertise, understand each other best. Often used when someone's insight into another's bad behavior reveals their own similar nature.

• 彼かれが詐さ欺ぎの手て口ぐちをすぐに見み抜ぬいたのは、まさに蛇じゃの道みちは蛇へびだね。

  He spotted the scam right away—it takes one to know one, I guess.

• 「蛇じゃの道みちは蛇へび」というから、彼かれの悪わる巧だくみはお見み通とおしだ。

  As the saying goes, 'a thief knows a thief,' so I can see right through his schemes.