What does Revelation 2:21 mean?

“To the angel of the assembly in Thyatira write: “The Son of God, who has his eyes like a flame of fire, and his feet are like burnished brass, says these things:

“I know your works, your love, faith, service, patient endurance, and that your last works are more than the first.

But I have this against you, that you tolerate your woman, Jezebel, who calls herself a prophetess. She teaches and seduces my servants to commit sexual immorality, and to eat things sacrificed to idols.

Behold, I will throw her into a bed, and those who commit adultery with her into great oppression, unless they repent of her works.

I will kill her children with Death, and all the assemblies will know that I am he who searches the minds and hearts. I will give to each one of you according to your deeds.

But to you I say, to the rest who are in Thyatira, as many as don’t have this teaching, who don’t know what some call ‘the deep things of Satan,’ to you I say, I am not putting any other burden on you.