Well, now I am doubly happy! Thank you.
I wouldn’t be surprised if quidditas had some connection with Thomas Aquinas. If I had a better connection with him myself, I could be surer.
But this idea has been a key one for me for many many decades. The “thatness”, the essential, what something is in its essence. Oddly enough, I’ve never thought of it as Platonic, although you can certainly make a case that it is. But when push comes to shove, I’m more mystical than philosophical.
One way or another, glad you managed to meet the Firefighter!
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