How do we know Christ's role as high priest is important for believers?

Christ’s high priestly role is vital for believers because He uniquely mediates our relationship with God. As the only perfect mediator, He stands before God on behalf of His people, offering the sacrifice of Himself to atone for our sins. This means that through His righteousness, we are justified and can fellowship with God. The breastplate of judgment, which bears the names of believers, illustrates how Christ continually represents and intercedes for us before the Father, affirming the eternal security and acceptance we have in Him.