The church in Thyatira (like the church in Pergamum), had allowed itself to become comfortable with compromise. In the case of the church in Thyatira, the compromise came in the form of tolerating and succumbing to false teaching.
If the church in Pergamum was about the enemy using temptation to lure us into compromise, the church at Thyatira, it’s about Satan using false teaching to cloud our better judgment. The good news, however, is that like with the church Pergamum, there is a powerful promise to all those that overcome.
Revelation 2:26–28 (ESV) 26 The one who conquers and who keeps my works until the end, to him I will give authority over the nations, 27 and he will rule them with a rod of iron…. 28 And I will give him the morning star.