Jesus' letter to the church of Thyatira starts off with a recognition of their love, faith, service, patient endurance, and how their good works are more than before, but from there it is all downhill. The fact that they tolerated a faction in the church approved of eating food offered to idols and fornication and even taught the deep things of Satan meant the elders were not guarding the flock. The Lord promised to deal with each according to their works. Our works come from our heart. It is a promise and a warning.