What does Revelation 3:19 mean?

So, because you are lukewarm, and neither hot nor cold, I will vomit you out of my mouth.

Because you say, ‘I am rich, and have gotten riches, and have need of nothing;’ and don’t know that you are the wretched one, miserable, poor, blind, and naked;

I counsel 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.

Behold, I stand at the door and knock. If anyone hears my voice and opens the door, then I will come in to him, and will dine with him, and he with me.

He who overcomes, I will give to him to sit down with me on my throne, as I also overcame, and sat down with my Father on his throne.

He who has an ear, let him hear what the Spirit says to the assemblies.”