 The discussion up until this point has centered around making sense of the general notion that an agent ought to do the (non-supererogatory) best that she is able to do. But some theories hold that an agent’s moral life is more complex than this because an agent’s ability to do less than the (non-supererogatory) best is also obligatory is some non-primary sense. This approach is motivated in part by the thought that some wrong actions are better than others. Michael McKinsey (1979: 391–392) develops this approach, defending a view with multiple levels of obligation. His view may be formulated as follows: