What does it mean that there is one God and one mediator?

The declaration that there is one God and one mediator is foundational to Christian theology. It affirms the monotheistic belief in a singular, sovereign God while simultaneously emphasizing that only Jesus can mediate between humanity and this holy God. This underscores the uniqueness of Christ's nature and mission. It also establishes the basis for genuine faith: there are not multiple pathways to God but one definitive route—through Jesus Christ. This truth is essential for understanding the gospel and the necessity of faith in Christ's redemptive work for salvation.