Ephesians 4:21 in the King James Version of the Bible reads: "If so be that ye have heard him, and have been taught by him, as the truth is in Jesus."

In this verse, the Apostle Paul is addressing the believers in Ephesus and reminding them of the importance of their education in the teachings of Jesus Christ. The verse contains a profound message about the transformative power of Christ's truth and the necessity of hearing and being taught by Him.

The verse begins with the phrase "If so be," which implies that Paul is assuming the Ephesian believers have indeed heard and been taught by Christ. This is a rhetorical device Paul uses to emphasize the certainty of their understanding and knowledge. Paul is not questioning whether the believers have heard and been taught by Christ, but rather affirming it as a foundational truth.

The next part of the verse, "that ye have heard him," emphasizes the importance of actively listening to the teachings of Jesus. It is not enough to passively hear His words, but one must truly listen and internalize His teachings. This highlights the crucial role of receptivity and openness in the process of spiritual growth and transformation. Hearing Jesus requires a willingness to engage with His message and allow it to impact one's heart and mind.

The verse continues with "and have been taught by him," underscoring the necessity of being instructed by Jesus. This implies a personal and intimate relationship with Christ, in which believers allow Him to guide and shape their understanding of the truth. It speaks to the idea of discipleship and the role of Jesus as the ultimate teacher and mentor for those who follow Him.

Finally, the verse concludes with "as the truth is in Jesus," highlighting the ultimate source and embodiment of truth in the person of Jesus Christ. This statement affirms Jesus as the standard of truth, against which all other teachings and beliefs must be measured. It also emphasizes the exclusive and non-negotiable nature of His truth, as well as its centrality in the lives of believers.

The verse touches on several important themes, including the primacy of Christ's teachings, the necessity of personal engagement with His message, and the transformative power of His truth. It also speaks to the idea of spiritual education and the role of Jesus as the ultimate authority and source of knowledge for believers.

The context of Ephesians 4:21 is important for understanding the broader themes of the letter. In Ephesians, Paul is addressing the unity and maturity of the church, and calling believers to walk in a manner worthy of their calling (Ephesians 4:1). He emphasizes the need for spiritual growth and the development of spiritual gifts within the body of Christ (Ephesians 4:11-16). The verse in question serves as a reminder to the Ephesian believers of the centrality of Christ's teachings in their individual and corporate lives.

In terms of symbolism, the verse can be seen as representing Jesus Christ as the ultimate source of truth and knowledge. It highlights the importance of actively listening to His words and being taught by Him, as well as the transformative power of His truth in the lives of believers. The verse also symbolizes the personal and intimate nature of the relationship between Christ and His followers, in which He serves as the authoritative guide and teacher.

In conclusion, Ephesians 4:21 carries a deep and profound message about the centrality of Christ's truth in the lives of believers. It emphasizes the importance of actively listening to His teachings, being instructed by Him, and allowing His truth to transform and shape one's understanding of the world. The verse serves as a reminder of the foundational role of Christ in the lives of believers, and the necessity of allowing His truth to permeate every aspect of their being.