Who said "Conscience is the real judge"?

This quote is attributed to Justice Wargrave.

Conscience is the real judge - Justice Wargrave

"Conscience is the real judge"

Justice Wargrave Justice

Character in And Then There Were None

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"Murder is justified when the victim deserves it."

"The guilty cannot hide forever."

"Justice must be served."

"Every man and woman is alone."

"Justice must always prevail."

"You think I'm just some animal?"

"Fighting for what's right never gets easier."

"Justice is worth fighting for."