And unto... the church of the Laodiceans write; I know thy works, that thou art neither cold nor hot: ..... So then because thou art lukewarm, and neither cold nor hot, I will spue thee out of my mouth. Rev. 3:14-16
"Laodicea had a monopoly in textiles, a world-renowned medical industry, and a prosperous financial center. Writers of the ancient world speak openly of their envy of Laodicean wealth. Record after record attests to their status.
Their one weakness was the water supply. Water had to be piped in to Laodicea. Cold water could come from the abundant supply at Colossae, but by the time it traveled the ten or so miles from the cold springs, it was lukewarm. About six miles away in Hierapolis were hot springs, but that water, too, was lukewarm when it reached Laodicea. Whether they piped in the cold or the hot water, it arrived at Laodicea lukewarm.
What does Christ mean by this metaphor? Cold water stimulates and invigorates. Nothing refreshes more than drinking a glass of cold water on a hot day. And hot water? It is useful for health. Not only do we mix it with teas, herbs, broths, and the like, but it also works as a solvent, good for cleaning just about anything.
What does lukewarm water do? Christ's complaint against the Laodiceans is revealed here: It is good for nothing! The Laodicean is useless to Him. Lukewarm water is an emetic: It makes one vomit. In terms of God's work, a lukewarm Christian is useless. The other traits of Laodiceanism spring from this characteristic of uselessness. As Head of the church, Christ cannot use them in the spiritual state in which He finds them. We should think of this in terms of biblical symbolism: Water represents God's Holy Spirit."