Basileia tou Theou, Empirical Dogmatics, Kingdom of God, Metropolitan Hierotheos of Nafpaktos, Monastery of St. Gregory Palamas, Patristic Theology, Protopresbyter John S. Romanides, St. Gregory Palamas, Theoria, Theosis, Uncreated Energies, Vasileia
The term ‘basileia (glory, rule) of God’, according to the patristic tradition and especially the teaching of St Gregory Palamas, means the uncreated Light of God.
Christ said to His Disciples: “Assuredly, I say to you that there are some standing here who will not taste death till they see the kingdom [basileia in Greek] of God present with power” (Mark 9:1). St. Gregory Palamas explains that His Transfiguration on Mount Tabor followed immediately after these words. Thus seeing the vasileia of God is the theoria (vision) of the uncreated Light on Mount Tabor during the Transfiguration of Christ. It follows that participation in the uncreated Light is participation in the basileia of God, which comes “with power”, through the energy of the Holy Spirit.
In the light of this teaching, in order better to convey this reality and to distinguish it from created reality, Fr. John Romanides uses the phrase ‘the glory and rule (basileia)’, instead of the term ‘kingdom’, which prevails in the English-speaking world.
—Empirical Dogmatics by Metropolitan Hierotheos of Nafpaktos