How do we know that Jesus is our advocate and fulfills God's promises?

Jesus Christ serves as our advocate because He fulfills every requirement of God's law on our behalf. As described in Psalm 89, God chose Jesus, the son of David, to be the faithful servant who accomplishes salvation. His sacrificial death and resurrection validate the promises made in the covenant of grace. Through His work, believers are assured that they are justified and can approach God without fear of condemnation. This assurance is grounded in the reality that Jesus paid our debt completely, thus securing our relationship with the Father.