In 2 Kings 8:19 in the King James Version (KJV), it states: "Yet the LORD would not destroy Judah for David his servant's sake, as he promised him to give him alway a light, and to his children."

This verse is a part of the account of the reign of King Jehoram of Judah. Throughout this chapter, we see a continuation of the theme of God's faithfulness to His promises, despite the unfaithfulness of His people. In this verse, we see the specific promise that God made to David, that he would always have a descendant on the throne of Judah.

The context of this verse is important in understanding its meaning. King Jehoram was ruling in Judah, and he did evil in the sight of the Lord, following the ways of the kings of Israel. Despite this, the Lord did not destroy Judah completely, because of the promise He had made to David. This demonstrates God's faithfulness to His word, even in the midst of the disobedience of His people.

One of the key themes present in this verse is the faithfulness of God. Throughout the Bible, we see God making and keeping promises to His people. In this case, the promise to David is upheld, even though his descendant, King Jehoram, was not a righteous king. This serves as a reminder that God's faithfulness does not depend on the actions of His people, but on His own character and integrity.

Another important theme in this verse is the concept of God's sovereignty. Despite the actions of the kings of Judah, the ultimate authority and control lay with God. He had made a promise to David, and He would see it through, regardless of the circumstances. This highlights the fact that God's plans and purposes will ultimately come to pass, despite any opposition.

The symbolism in this verse can be seen in the mention of "a light" that God promised to David and his descendants. This "light" can be understood as a symbol of God's presence, guidance, and blessing. Throughout the Bible, light is often used symbolically to represent God's truth and righteousness. In this context, it can be seen as a promise that the line of David would continue to receive God's favor and blessing, despite the unfaithfulness of individual kings.

This verse also points to the coming of the ultimate offspring of David, Jesus Christ, who is often referred to as the "Light of the World" in the New Testament. The promise to David ultimately finds its fulfillment in the person of Jesus, who is the ultimate fulfillment of God's promises to His people. This adds a layer of significance to the verse, as it points forward to the coming of the Messiah.

In conclusion, 2 Kings 8:19 in the KJV is a powerful reminder of God's faithfulness to His promises, His sovereignty over all things, and the ultimate fulfillment of His plans through Jesus Christ. It serves as a reassurance to believers that God's faithfulness does not depend on our own actions, but on His unchanging character. It also points to the hope and salvation that is found in Christ, the ultimate descendant of David.