There is a lengthy paper here by Father Matta el Meskeen (Matthew the Poor) about the manifestation of light in the Christian life. I haven't read it yet but even the first page is good.
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Here is a bit..
Quote:Thus, God began his revelation to man based on the inner man, i.e., his spiritual consciousness, where God is revealed not through fire, but through the inextinguishable and uncreated true light. It is the light of God Himself that uncovers that which is hidden. It enlightens man's heart, mind and life. It reveals all Godly matters and the eternal life in which he is invited to live with God and to enter into an eternal relationship with Him. For the revelation of God is to know the truth, eternal life, and the total knowledge of God, which inevitably absorbs all that concerns God. It is the knowledge of eternal truth itself, acquiring it, owning it, uniting and sharing with it. It is impossible for anyone to get to know it unless he totally understands and grasps it. Therefore he who does not know the truth does not possess it and share it. Such are God's ways.