Laodicea
Laodicea was well known for its hot springs. The water was brought trough aquaeducts into the city. When it finally arrived there, it was only lukewarm and due to its content of sulphur and salt, undrinkable. You can drink this bitter water in small amounts, when it is hot or cold, but not when it is lukewarm.

Revelation 3,14-21
To the angel of the church in Laodicea write: These are the words of the Amen, the faithful and true witness, the ruler of God's creation. I know your deeds, that you are neither cold nor hot. I wish you were either one or the other! So, because you are lukewarm -- neither hot nor cold -- I am about to spit you out of my mouth. You say, 'I am rich; I have acquired wealth and do not need a thing.' But you do not realise that you are wretched, pitiful, poor, blind and naked. I counsel you to buy from me gold refined in the fire, so that you can become rich; and white clothes to wear, so that you can cover your shameful nakedness; and salve to put on your eyes, so that you can see. Those whom I love I rebuke and discipline. So be earnest, and repent. Here I am! I stand at the door and knock. If anyone hears my voice and opens the door, I will come in and eat with him, and he with me. To him who overcomes, I will give the right to sit with me on my throne, just as I overcame and sat down with my Father on his throne.

Luzius Schneider 19. June 1999