The Bible verse Mark 5:20 in the King James Version (KJV) states, "And he departed, and began to publish in Decapolis how great things Jesus had done for him: and all men did marvel." This verse is part of the larger story in Mark 5:1-20, which recounts the healing of a demon-possessed man by Jesus. This particular verse follows the man's healing and his request to follow Jesus, which Jesus denies, instructing the man to return to his home and share the great things that Jesus had done for him.

The context of this verse is important in understanding its significance. The entire chapter of Mark 5 explores the power and authority of Jesus over demons, sickness, and death. In the preceding verses, Jesus and His disciples arrive in the country of the Gadarenes, where they encounter a man possessed by an unclean spirit. This man lived among the tombs, was uncontrollable, and tormented by the legion of demons within him. However, when Jesus arrived, He commanded the unclean spirits to come out of the man and into a herd of swine, ultimately freeing the man from the oppression of the demons.

After the miraculous healing, the man begged Jesus to allow him to accompany Him, but Jesus instead commissions him to go home and share the great things that Jesus had done for him. The man obeys Jesus and travels to the region of Decapolis, which was a group of ten cities located east of the Sea of Galilee. There, he proclaims the great things that Jesus has done for him, and the response of the people is one of amazement and wonder.

The themes present in Mark 5:20 include the power and authority of Jesus, obedience, and the call to witness and testify. The verse highlights the transformative power of Jesus in the life of the demon-possessed man, as well as the man's obedience to Jesus' command to share his testimony. This obedience leads to the spread of Jesus' fame throughout the Decapolis region, as all who heard the man's testimony marveled at the great things that Jesus had done for him.

Moreover, this verse also embodies the concept of evangelism and the impact of personal testimony. By sharing his story, the healed man becomes an instrument for spreading the message of Jesus to others. His testimony serves as a powerful witness to the transformative work of Jesus, prompting others to marvel at His great deeds.

Symbolically, this verse represents the broader mission of the Christian faith, which is to share the Gospel and testify to the power of Christ's salvation. It serves as a reminder of the importance of personal witness in bringing others to faith and glorifying God. Additionally, the man's obedience reflects the response of a grateful heart to the work of God in one's life, compelling the individual to share their testimony with others.

In conclusion, Mark 5:20 in the King James Version captures the transformative power of Jesus in the life of the demon-possessed man and his subsequent obedience to Jesus' command to share his testimony. The verse underscores the themes of Jesus' authority, obedience, evangelism, and the impact of personal testimony in spreading the message of the Gospel. It serves as a powerful reminder of the responsibility and privilege of sharing the great things that Jesus has done for each of us, and the profound impact that our testimonies can have in leading others to marvel at His greatness.