When we turn to ethical theory in the face of hard cases, we should also be less interested inbeing told what to do than inbeing assisted in thinking better about what to do. On a theoretical level, this means understanding better the reasons not only why we should do one thing rather than another but also why some moral decisions are difficult, and why there is no single, clearly right answer to some moral dilemmas. Thus an ethical theory that places first priority on getting the right answer is not looking at its most important tasks in the right way.

Kantian Ethics (2008) - Ch. 3. Ethical Theory