For there is but one essential justice which cements society, and one law which establishes this justice. This law is right reason, which is the true rule of all commandments and prohibitions. Whoever neglects this law, whether written or unwritten, is necessarily unjust and wicked.
Marcus Tullius CiceroWhen trying a case [the famous judge] L. Cassius never failed to inquire "Who gained by it?" Man's character is such that no one undertakes crimes without hope of gain.
Marcus Tullius Cicero