One of the central problems of Cicero's 'De officiis' is 'honestum' and its relation to 'utile'. It gains an expressive form of the question in Cicero's book III of 'De Officiis'. Are these concepts principally equal, or antinomic? Cicero holds that the conflict between them is only artificial. 'Humanitas' always has to be the priority; acting against it men destroy social chains as well as the morality.