Figure 4 shows a corresponding combination of independent arguments pointing to the same practical conclusion: being asked the way by driver John, I should not direct him in a wrong direction (tell him that he will get to destination by going to the left), given that my false statement would both be a lie and harm John, impeding him from reaching its destination. Arguments A and B refer to two parallel principles: the duty to be truthful and the duty not to harm others (a foremost requirement of the law according to Justinian’s Digest, D 1.1.1 ).