Guilty Mind & Wrongful Act are two essential conditions of penal liability. Mens rea is a Latin word that means “guilty mind” No conduct is unlawful unless a mens rea accompanies it. The common law maxim “actus non facit reum nisi mens sit rea,” which means “the act is not guilty until the mind is guilty.” defines mens rea the best The accused cannot be held accountable under the criminal law unless he can be proved to have acted with intent to commit a crime.