If you're looking for a good description of God it's always hard to beat Pseudo-Dionysius the Areopagite:
We are raised up to the enlightening beams of the sacred scriptures, and with these to illuminate us, with our beings shaped to songs of praise, we behold the divine light, in a manner befitting us, and our praise resounds for that generous Source of all holy enlightenment, a Source which has told us about itself in the holy words of scripture.
We learn, for instance, that it is the cause of everything, that it is origin, being, and life. To those who fall away it is the voice calling, "Come back!" and it is the power which raises them up again. It refurbishes and restores the image of God corrupted within them. It is the sacred stability which is there for them when the tide of unholiness is tossing them about. It is safety for those who made a stand. It is the guide bringing upwards those uplifted to it and is the enlightenment of the illuminated. Source of perfection for those being made perfect, source of divinity for those being deified, principle of simplicity for those turning toward simplicity, point of unity for those made one; transcendently, beyond what is, it is the Source of every source. Generously and as far as may be, it gives out a share of what is hidden.
...It is the Life of the living, the being of beings, it is the Source and the Cause of all life and of all being, for out of its goodness it commands all things to be and it keeps them going.
--Pseudo-Dionysius the Areopagite, from The Divine Names
