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There is quite a lot, not what I would consider to be easy reading but thought-provoking nonetheless:

- Byzantine Theology is a good overview of many of the concepts that differentiate the East from the West (https://www.amazon.com/Byzantine-Theology-Historical-Trends-...)

- Divine Essence and Divine Energies (a critical distinction that has been lost in the West) (https://www.amazon.com/Divine-Essence-Energies-Ecumenical-Re...)

- Any of the works by St. Maximus the Confessor

Lots more...

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