Three Assurances of the Resurrection

The resurrection of Jesus Christ is the seal of guarantee of the finished work of providing complete justification and salvation for all sinners.
The resurrection of Jesus Christ is the assurance of a coming resurrection for all people.
The resurrection of Jesus Christ is the assurance of a coming judgment by Christ, the resurrected One. Believers will have a judgment for rewards and unbelievers will have a judgment for their sin having rejected Him and His work on their behalf.