1 John 3:18-19 in the King James Version of the Bible says, "My little children, let us not love in word, neither in tongue; but in deed and in truth. And hereby we know that we are of the truth, and shall assure our hearts before him."

The epistle of 1 John was written by the apostle John, who was also known as the beloved disciple of Jesus. This letter is believed to have been written towards the end of the first century to a group of believers who were facing heretical teachings and moral challenges. In these verses, John encourages the believers to demonstrate genuine love through their actions and not just in words, emphasizing the importance of living out the truth of the gospel.

The themes presented in 1 John 3:18-19 include love, truth, and assurance. John addresses the idea of love not just as a feeling or an expression, but as a deliberate and consistent action. He emphasizes the importance of demonstrating love through deeds that align with the truth of the gospel. This reflects the core teachings of Jesus, who emphasized the significance of loving one another and living in accordance with the truth (John 13:34-35).

The context in which these verses are placed is significant. The believers to whom John wrote were facing false teachings and moral confusion. In response, John urges them to not just profess love with their words, but to tangibly demonstrate it through their actions. This would have been particularly meaningful in a community facing challenges to their faith and ethical standards. John's call for genuine love in action was a counter to the superficial and deceptive teachings that were trying to lead the believers astray.

The symbolism in these verses is found in the contrast between love in word and love in deed, as well as the concept of truth as a guiding principle. Love in word represents mere lip service, while love in deed reflects genuine, sacrificial love that is expressed through actions. The emphasis on truth highlights the importance of living a life that aligns with the teachings of Jesus and the foundational truths of the gospel. This truth serves as a guide for discerning genuine love and for assuring the hearts of believers before God.

The call to demonstrate love through actions rather than mere words is a timeless message that continues to resonate with believers today. It challenges us to examine the sincerity of our love for others and encourages us to actively seek opportunities to express love in tangible ways. This verse also serves as a reminder that our actions are a reflection of our faith and serve as a testament to the transformative power of the gospel in our lives.

In conclusion, 1 John 3:18-19 serves as a powerful exhortation for believers to authentically live out their faith through love in action and to find assurance in the truth of the gospel. It speaks to the timeless themes of love, truth, and assurance, and offers a relevant message for believers facing moral challenges and false teachings. The symbolism in these verses and their context within the larger epistle of 1 John provide a rich and meaningful framework for understanding the importance of genuine love and living according to the truth of the gospel.