How do we know that Christ has all power?

In Matthew 28:18, Jesus asserts that 'All power is given unto me in heaven and in earth.' This powerful statement does not suggest that He lacked power before, but rather that His fulfillment of covenant obligations as mediator and substitute for His people has manifested His authority. The assurance of this power is fundamental for believers, indicating that Christ's commission to His disciples is underpinned by His control over all creation and His success on the cross. This empowers the church to reach out to all nations, confident that He will gather His elect from every corner of the earth.