What does Revelation 3:18 mean?

In response to the Laodicean church's smug self-assessment, Jesus advises it to buy pure gold from Him. He also offers the church white garments and eye ointment. Gold, garments, and eye salve were Laodicea's chief exports. The apostle Peter described faith, approved by the test of fire, as much more valuable than gold (1 Peter 1:7). The Laodiceans boasted about their wealth, but they needed genuine faith that was far more valuable than material wealth.

The city was famous for its manufacturing of glossy wool, but Jesus offered the church members white garments that would cover their spiritual nakedness. The Laodicean church was blind to spiritual realities. Its focus was on earthly comforts and prosperity. Laodicea was well known throughout the region for its production of eye salve that was used to treat a number of eye diseases. Jesus offers salve that could cure spiritual blindness. Symbolically speaking, if the Laodiceans applied the eye salve Jesus offered, they would be able to see their lukewarm condition and subsequently repent.