Who will guard the guards?

Quis custodiet ipsos custodes? is a Latin phrase from the Roman poet Juvenal, which is literally translated as “Who will guard the guards themselves?” Also sometimes rendered as “Who watches the watchmen?”, the phrase has other idiomatic translations and adaptations such as “Who will guard the guards?”.

The question is put to Socrates, “Who will guard the guardians?” or, “Who will protect us against the protectors?” Plato’s answer to this is that they will guard themselves against themselves.