Revelations 3: 16
The Laodiceans were in spiritual things cold comparatively, but not cold as the world outside, and as those who had never belonged to the Church. The lukewarm state, if it be the transitional stage to a warmer, is a desirable state (for a little religion, if real, is better than none); but most fatal when, as here, an abiding condition, for it is mistaken for a safe state (Rev 3:17). This accounts for Christ’s desiring that they were cold rather than lukewarm. For then there would not be the same “danger of mixed motive and disregarded principle” [Alford]. Also, there is more hope of the “cold,” that is, those who are of the world, and not yet warmed by the Gospel call; for, when called, they may become hot and fervent Christians: such did the once-cold publicans, Zaccheus and Matthew, become. But the lukewarm has been brought within reach of the holy fire, without being heated by it into fervor: having religion enough to lull the conscience in false security, but not religion enough to save the soul: as Demas, 2 Ti 4:10. Such were the halters between two opinions in Israel (1 Ki 18:21; compare 2 Ki 17:41; Mt 6:24).
Jamieson, R., Fausset, A. R., & Brown, D. (1997). Commentary Critical and Explanatory on the Whole Bible (Vol. 2, p. 562). Oak Harbor, WA: Logos Research Systems, Inc.