I was thinking about the dialectical approach of Hegel. The idea starts with pure Being which by itself implies Non-Being since Being is without "being things".  And Non-Being implies Being for the reason nothing implies nothing of being things, so there is an implicit recognition that there are being things. The resolution to Hegel is Becoming. But it occurs to me that Becoming requires a third category--time. [Without time there can be no Becoming]. And this model I think provides Hegel with a long series in which every concept implies its opposite, and the solution is by adding a third category. [After all hot and cold are two contradictory things until you add time and/or place.] So Hegel wants to continue this series --adding concept after concept until you get to the Absolute Idea [God] where all contradictions are resolved.[I want to add that Dr Kelley Ross [https://www.friesian.com/origin/chap-4.htm#sect-1][or here https://www.friesian.com/origin/] brings in his PhD thesis that this original idea of Hegel is valid. Just that he disagrees with the long series expansion.

Dr Kelley Ross writes:"The similarity and the connection that Hegel described between Being and Not Being is also very germane, although the motivation and explanation here will be different from his."