Motive-the psychological feature that arouses an organism to action toward a desired goal; the reason for the action; that which gives purpose and direction to behavior; An incentive to act; a reason for doing something; anything that prompted a choice of action. Mens rea-(law) criminal intent; the thoughts and intentions behind a wrongful act (including knowledge that the act is illegal); (law) a guilty mind, a conscious knowing by the perpetrator that the act s/he committed was illicit 說到底一個Motive是犯罪的原因，Mens rea是罪惡感的意思。