Certainty is an emotional state that we call "True/False".
   Uncertainty is an emotional state that has many names.that can
   be represented by the "/" inbetween True/False.

   Instead of me rewriting, I'll use someone else's words I found
   that explain the connection to Plato better, [1]Eric Little

   "The principles of Contradiction and of Excluded Middle can both
   be traced back to Plato, by whom they were enounced and
   frequently applied; though it was not till long after, that
   either of them obtained a distinctive appellation. To take the
   principle of Contradiction first. This law Plato frequently
   employs, but the most remarkable passages are found in the
   Ph*do, in the Sophista, and in the fourth and seventh books of
   the Republic. [Hamilton LECT. V. LOGIC. 62]"
   [2]https://en.wikipedia.org/wiki/Law_of_thought

   So, some guy named Hamilton linked it up. That's why I skipped
   Aristotle, who I used to blame for the law of excluded middle.
   The concept of EITHER/OR - the segmentation of concepts into
   "Schools of thought" - artificial segmentation of reality into
   parts for our ease of teaching and consumption... has led us to
   BELIEVE (with certainty - both emotional states) that _this is
   how the world really is_.

   Yet our experiences tell us otherwise. Ok I'll pause there for a
   moment. I'm trying to compress a lifetime obsession around
   trying to understand everything into a few words and it's hard.
   There's a very good chance that I don't make any sense, so I'll
   wait b4 going further.

References

   Visible links
   1. https://www.facebook.com/erllaw?hc_location=ufi
   2. https://en.wikipedia.org/wiki/Law_of_thought?hc_location=ufi