The Universal Law Formula of the Categorical Imperative (“the CI”) is an unconditional moral law that states that one should “act only according to that maxim by which one can at the same time will it to become a universal law." A maxim is the motivating principle or reason for one's actions. A moral act is an act by which its maxim can become a universal law that would apply to all rational creatures. As a universal law, all rational creatures must act according to this maxim. CI requires imagining a world in which the maxim one wants to act according to becomes a universal law, in which all people must act according to this maxim. If this maxim is wanted to become a universal law that all rational creatures must follow, but there is a contradiction in the conception or will, then this maxim cannot become a universal law and therefore the act is not morally permissible. A contradiction of conception occurs when, wanting one's maxim to become a universal law, one imagines a logically impossible world, since there is a contradiction in the very idea of ​​every rational creature acting according to this maxim. On the contrary, a contradiction in the will does not produce a logically impossible world, but there is a contradiction in wanting what one intends to do and in wanting the maxim to become universal law. An example of the application of IC reads: A man wants to deceive someone to get what he wants. This man acts according to a maxim that says: “To get what I want, I will deceive.” According to the IC, one must consider a world in which everyone acts according to this maxim, wanting this maxim to become universal law. In a world where everyone cheats to get what they want, it would be impossible to deceive anyone. Since everyone lies... middle of paper... to say: "you can cheat to get what you want", acting according to this generalized maxim will prove morally incorrect and the CI would lead to the wrong conclusion. Therefore, since CI can lead to the morally wrong conclusion, CI turns out to be a useless principle if not complemented by the idea of ​​generalization but without a formal method describing how to generalize a maxim, the CI can lead to contradictory results and, therefore, cannot be used to determine whether an action is morally correct. Where the application of the CI leads to opposite conclusions from the same situation, there is a contradiction and therefore the CI cannot be true. Therefore, Mill's criticism is fair, since if one cannot decide whether an action is right or wrong in all circumstances, then IC is an incomplete theory that cannot be applied in any situation..