John Gill examines the character and ultimate fate of the wicked, referred to as 'sons of Belial,' contrasting them with the just ruler, the Messiah. He emphasizes that these wicked individuals are like thorns, harmful and unfruitful, destined for destruction and eternal punishment. Gill warns that they are unprofitable to God and man, and will ultimately face God's wrath, being thrust away and burned. He calls for repentance and turning to Christ as the only refuge from impending judgment. The sermon serves as a stark reminder of the consequences of rejecting God's authority and grace.