What does the Bible say about lukewarmness?

In Revelation 3:14-22, Christ addresses the church of Laodicea, condemning their lukewarmness. They were neither cold nor hot, and this lukewarm state was so repugnant to Him that He stated He would spew them out of His mouth. This passage illustrates the danger of spiritual complacency, where believers feel self-sufficient and fail to recognize their desperate need for Christ. Lukewarmness is a gradual apostasy and leads to spiritual death, as it manifests indifference towards Christ, causing believers to neglect their relationship and the importance of His gospel.