Gold, clothing, and eye salve represent the three major industries of Laodicea: banking, textiles, and medicines.
Gold, spiritual riches (I Peter 1:7), contrasts with the word "poor," and fire symbolizes trial. God advises them to obtain spiritual riches produced through trials, which the self-sufficient Laodicean avoids by compromising.
"White garments" contrast with their nakedness. Clothing helps us to distinguish people and groups. Because of the differences between men and women's clothing, sexual distinctions can be made. Clothes reveal status: A man in a well-tailored suit falls into a different category than a beggar in rags. Clothing provides a measure of comfort and protection from the elements. It hides shame and deformity. Biblically, God uses it to symbolize righteousness (Revelation 19:8). He instructs the Laodicean to dress himself in the holiness of God to cover his spiritual nakedness, self-righteousness.
Their need of eye salve contrasts with their blindness. Commentators understand it to represent God's Spirit coupled with obedience. The combination of the two gives a Christian the ability to see - to understand spiritual things. "But God has revealed them to us through His Spirit. For the Spirit searches all things, yes, the deep things of God. For what man knows the things of a man except the spirit of the man which is in him? Even so no one knows the things of God except the Spirit of God" (I Corinthians 2:10-11). "The fear of the LORD is the beginning of wisdom; a good understanding have all those who do His commandments" (Psalms 111:10).
John W. Ritenbaugh
The World, the Church, and Laodiceanism