Saint Gregory is one of the great heroes of the Orthodox faith. He stood against the logic of western scholastic thinking and defended the age old truth that man can know God through His energies. While the West rejected this reality in man and put all their faith in reason and philosophy, in the East knew that man can seek and have an intimate real experience in union with God's energies. This is commonly called noetic prayer. His teaching was confirmed in a council and is in agreement with the earlier Church Fathers.
Below are three videos that explain in simple terms ;what Saint Gregory taught.
Reference for this series of videos is the article by Metropolitan Hierotheos: Rationality & Mysticism
