^2:23 I will strike her children dead. Then all the churches will know that I am he who searches hearts and minds, and I will repay each of you according to your deeds.

I will STRIKE her CHILDREN dead.

While this may mean her real illegitimate children born from the immorality, most likely these are her spiritual children. These children become the members of Satan's imitation church (who later accept the mark of the beast).

Then ALL THE CHURCHES will know that I AM HE who SEARCHES HEARTS and MINDS,

Since all the churches read the composite revelations of John, this specifically is given to all of them (not just Thyatira). This implies that judgment is not only disciplinary but also exemplary. In 1 Timothy 5:19-22, credable witnesses can bring a problem or sin out into the open. Paul indicates in Hebrews 4:10-13 that the "I AM HE" in this verse really is the "Word of God" which searches the thoughts and attitudes. That is why "dead Christians" are ones who seldom, if ever, read their Bible. Looks like that was happening at Thyatira. Is that happening within our churches too?

and I will repay each of you ACCORDING to your deeds.

ALL mankind will be given their rewards. The judgment against Jezebel (Satan's imitation church) will NOT be kept under wraps. If you are a 'silent follower of Jezebel', someday you, too, will be exposed. Salvation is the result of faith; judgment always is based on deeds. Read all about judgment in Romans 2:1-8.