 In reply, the ideal utilitarian may try to capture the common-sense verdict by noting breaking promises erodes mutual confidence and keeping promises enhances mutual confidence (RG 38; FE 187). These goods and evils tip the balance in favour of keeping the promise. Ross frowns on this response. There will no doubt be cases, he says, where all the benefits of breaking the promise will outweigh (though only very slightly) all the costs associated with breaking it, and in this case the ideal utilitarian will have to admit it is obligatory to break the promise (RG 38). Ross thinks this is not the verdict of common-sense morality.