Revelation 3:15-17

Amplified Bible

¹⁵‘I know your deeds, that you are ^[a]neither cold (invigorating, refreshing) nor hot (healing, therapeutic); I wish that you were ^[b]cold or hot. ¹⁶So because you are lukewarm (spiritually useless), and neither hot nor cold, I will vomit you out of My mouth [rejecting you with disgust]. ¹⁷Because you say, “I am rich, and have prospered and grown wealthy, and have need of nothing,” and you do not know that you are wretched and miserable and poor and blind and naked [without hope and in great need],^(A)

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Footnotes

Revelation 3:15 This phrase and the word lukewarm in v 16 form a metaphor that is probably based on the quality of the water supply of Laodicea, which was delivered by aqueduct from the hot mineral springs about five miles away. During its journey, the water cooled to a warm or lukewarm temperature.
Revelation 3:15 I.e. alive, productive—beneficial in one way or the other.