John 14:20 (KJV) states, "At that day ye shall know that I am in my Father, and ye in me, and I in you." This verse is part of a longer passage in which Jesus is preparing his disciples for his imminent departure. He reassures them that although he will no longer be physically present with them, they will still have a deep connection with him and with God the Father.

This verse contains profound theological significance and provides insight into the relationship between Jesus, the Father, and his disciples. It speaks to the concept of unity and oneness within the Godhead, as well as the intimate and personal connection that believers have with Jesus.

The phrase "I am in my Father, and ye in me, and I in you" emphasizes the unity and interconnectedness between Jesus, the Father, and his disciples. It illustrates the deep and inseparable bond that exists within the Godhead, as well as the close relationship that believers have with Jesus. This verse points to the mystical union between God and humanity, a central theme in Christian theology.

The first part of the verse, "At that day ye shall know that I am in my Father," speaks to the revelation and understanding that the disciples will have about the divine nature of Jesus and his inseparable union with the Father. This points to Jesus's divine identity and his oneness with God. It also foreshadows the future realization of the disciples about the full nature of Jesus as the Son of God.

The second part of the verse, "and ye in me," highlights the reciprocal nature of the relationship between Jesus and his disciples. It emphasizes the believers' union with Jesus, indicating that they are deeply connected to him. This union is a central aspect of Christian salvation, as believers are "in Christ" and have a new identity and life in him.

The final part of the verse, "and I in you," further emphasizes the intimate connection between Jesus and his disciples. This speaks to the indwelling presence of the Holy Spirit within believers, as well as the transformative power of Christ in the lives of believers. It points to the ongoing work of Jesus in the lives of his followers, empowering and guiding them through the presence of the Holy Spirit.

The broader context of this verse is important for understanding its significance. In the preceding verses, Jesus promises the coming of the Holy Spirit, who will be a Helper and Comforter for the disciples after his departure. This underscores the ongoing presence and work of Jesus in the lives of believers through the Holy Spirit.

Symbolically, this verse represents the deep and intimate bond between Jesus and his followers. It speaks to the mystical union between God and humanity, showing the inseparability of believers from Christ and the transformative power of the indwelling Holy Spirit. This verse also highlights the divine nature of Jesus and his oneness with the Father, pointing to the foundational beliefs of the Christian faith.

Overall, John 14:20 (KJV) holds profound theological significance, emphasizing the unity and oneness within the Godhead, as well as the deep and intimate connection between Jesus and his disciples. It speaks to the transformative power of Christ in the lives of believers and points to the ongoing presence and work of Jesus through the Holy Spirit. This verse serves as a source of comfort, assurance, and hope for believers, reminding them of their close and unbreakable union with Christ.