If there is one question which the enlightened and liberal have the habit of deriding and holding up as a dreadful example of barren dogma and senseless sectarian strife, it is this Athanasian question of the Co-Eternity of the Divine Son. On the other hand, if there is one thing that the same liberals always offer us as a piece of pure and simple Christianity, untroubled by doctrinal disputes, it is the single sentence, ‘God is Love.’ Yet the two statements are almost identical; at least one is very nearly nonsense without the other. The barren dogma is only the logical way of stating the beautiful sentiment. For if there be a being without beginning, existing before all things, was He loving when there was nothing to be loved? If through that unthinkable eternity He is lonely, what is the meaning of saying He is love? The only justification of such a mystery is the mystical conception that in His own nature there was something analogous to self-expression; something of what begets and beholds what it has begotten. Without some such idea, it is really illogical to complicate the ultimate essence of deity with an idea like love.
—from The Everlasting Man by G.K. Chesterton, Part Two: IV: The Witness of the Heretics