Leibniz defined a perfection as a simple, positive quality in the highest degree.

Norman Malcolm [says][1] 

> I do not find his  definition of a perfection intelligible. For one thing, it assumes that certain qualities or attributes are "positive" in their intrinsic
 nature, and others "negative" or "privative," and I have not
 been able clearly to understand that. For another thing, it
 assumes that some qualities are intrinsically simple

I'd very much like to see a discussion about this definition and about the objections that Malcolm mentions but I haven't been able to find one. Are there any recommended articles or books about this topic? 

  [1]: http://www.jstor.org/stable/2182266?seq=1#page_scan_tab_contents