When we met John the Baptist in chapter 1, he was preparing the way for Jesus. Some who heard the truth of God's word readily accepted and believed. Others, however, were enraged with what he had to say to the point that they did whatever they deemed fit. These verses show us the dark side of an evil heart but also the power of the truth on the heart. In this flashback, there's dancing, debauchery, and deceit. Then, finally, a rash oath brings immediate regret and an end to the preparation.