Kant basic rule or idea is that we have a duty to do that which is right; and that if we want to determine whether or not an action is morally acceptable, all we need to do is consider whether or not it makes sense for us to recommend to everybody should do whatever we are considering. Kant argues and gives circumstances that may lead one to desire to promise to do something he really has no intention of doing. So, he considers whether it would be acceptable as a law for everyone to make promises that they have no intention of keeping. Considering the result that promises would be completely void of meaning, Kant sees that lying can't be a law, and so, cannot be morally condoned. That's one of Kant’s main points of his rule. Duty, Kant has