What does Revelation 3:18 mean?

So I’m telling you: buy real gold from me, the kind that’s been refined by fire, so you’ll actually be rich. Get white clothes from me so you can cover your shame, and ointment for your eyes so you can see. Revelation 3:18 - Modern Text Bible

(Jesus urges them to seek true spiritual wealth, purity, and insight from him, not from their own resources.)