Isaiah 41:21 in the King James Version reads: "Produce your cause, saith the Lord; bring forth your strong reasons, saith the King of Jacob."

This verse is part of a larger passage in the Book of Isaiah, in which the prophet Isaiah is speaking on behalf of the Lord to the people of Israel. This particular verse challenges the people to present their case and their strongest arguments, as the Lord is prepared to respond and make His case.

The context of this verse is important for understanding its full meaning. In the preceding verses, God is reminding the Israelites of His faithfulness and power in their history, and warning them not to turn to idols and false gods. In verse 21, the Lord is essentially calling out the people and their idols, challenging them to present their case and their reasons for turning away from Him.

The themes present in this verse are that of justice, justification, and the sovereignty of God. The Lord is essentially challenging the people to justify their actions and their decisions in turning away from Him. This reflects God's role as the ultimate judge, who demands accountability from His people. It also reflects the theme of God's sovereignty, as He is confident in His own righteousness and is willing to entertain the arguments of the people.

The symbolism in this verse is found in the imagery of a legal dispute or courtroom drama. The language of "producing a cause" and "bringing forth strong reasons" invokes the image of a legal case being presented before a judge. In this case, the judge is the Lord, who is calling the people to present their case against Him. This symbolism serves to emphasize the serious nature of the situation and the weight of the people's actions in turning away from God.

The verse also refers to the "King of Jacob," which is a title used to refer to God as the king and ruler of Israel. This title emphasizes God's authority and kingship over His chosen people. It serves as a reminder to the Israelites that they are accountable to their king, and that they should be prepared to justify their actions before Him.

In a broader theological sense, this verse can be seen as a reflection of the concept of divine justice and the accountability of humanity before God. It emphasizes the idea that God will not be swayed by empty arguments or false justifications, but demands honesty and integrity in the actions and decisions of His people.

Overall, Isaiah 41:21 in the King James Version presents a powerful challenge from the Lord to His people, calling them to account for their actions and decisions. It emphasizes the themes of divine justice, God's sovereignty, and the accountability of humanity before God. The symbolism of a legal dispute serves to underscore the seriousness of the situation and the need for the people to be honest and forthright in their dealings with the Lord.