In the book of Revelation, the letters to the seven churches (Revelation 2-3) address specific issues within each congregation. Considering the letter to Laodicea (Revelation 3:14-22), what does the imagery of being 'lukewarm' signify in the context of first-century Laodicean society, and how does this critique challenge the church's self-perception of being 'rich, wealthy, and needing nothing'?