Paul is asserting the truthfulness of his statements by appealing to the highest authority he knows: God, the Father of Jesus Christ. This appeal underscores the seriousness with which Paul approaches his mission and message. By invoking God as his witness, Paul assures the Corinthians of his sincerity and the authenticity of his experiences and teachings.
The mention of God as the Father of the Lord Jesus also reinforces the close relationship between God and Jesus, emphasizing the divine nature of Christ and the eternal praise due to God. This verse serves as a reminder for believers to uphold truth and integrity in their own lives, recognizing that God is always aware of their actions and intentions. It encourages a life of honesty and transparency, knowing that God, who is to be praised forever, is the ultimate judge of truth. This assurance of divine oversight can be a source of comfort and motivation to maintain integrity, even in difficult circumstances.