Answer:
There is a very brief synopsis on the spirit of each Yom Tov as told by Rav Shimshon Pincus in the article http://revach.net/article.php?id=2035.
The Bnei Yisaschar is also an excellent source for this and we quote him periodically in articles in Moadim/Around The Year. This concept is a big part of what we do on Revach and much material can be found by searching on the site.
I hope this helps.
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