What does it mean to be a vessel of God's mercy?

In the sermon, the merchant man is described as a vessel of God's mercy, emphasizing that he is one of God's elect who will ultimately respond to God's call. This concept reflects God's sovereignty in salvation as seen in Romans 9:23-24, where God prepares vessels of mercy for glory. It portrays the individual as someone who, despite being initially lost in sin, is brought to the knowledge of Christ by God's grace, highlighting the importance of divine mercy in the process of regeneration and faith.