How do we know that Christ's mediatorship is necessary?

The need for a Mediator arises from the great divide created by sin, which has established enmity between God and humanity (Galatians 3:20). As sinners, we are considered children of wrath (Ephesians 2:3), and there is no communion with God without a reconciliatory figure. Christ's mediatorship ensures that judgment can coexist with mercy, satisfying divine justice while offering forgiveness. Without this mediation, humanity cannot hope for salvation or eternal life (John 8:24). Thus, Christ serves this vital role so that God can be just and the Justifier of the one who has faith in Jesus (Romans 3:26).