Why is the testimony from God the Father at Jesus' baptism important?

At Jesus' baptism, the voice of God the Father declares, 'This is my beloved Son, in whom I am well pleased' (Luke 3:22). This declaration is paramount as it reveals Jesus' divine sonship and God's approval of his mission. It underscores the fact that every believer is accepted by God through their relationship with Christ, and not through their own efforts to adhere to the law. This truth is foundational to the Gospel, which invites sinners to stop seeking righteousness through works and to rely completely on Christ, the beloved Son who satisfies divine justice and provides peace with God.