3:18 I advise you to buy from Me gold refined by fire, that you may become rich, and white garments, that you may clothe yourself, and that the shame of your nakedness may not be revealed; and eye salve to anoint your eyes, that you may see.

I advise you to BUY FROM ME

For a church so involved in materialism (apparently from all the wealth of the city), to ask them to "BUY" points an accusing finger at them and says they don't have everything SPIRITUALLY. In fact, they have just enough spiritualism to make them "lukewarm".