Calvin on Christ our Victor

Finally, since as God only he could not suffer, and as man only could not overcome death, he united the human nature with the divine, that he might subject the weakness of the one to death as an expiation of sin, and by the power of the other, maintaining a struggle with death, might gain us the victory … But special attention must be paid to what I lately explained, namely, that a common nature is the pledge of our union with the Son of God; that, clothed with our flesh, he warred to death with sin that he might be our triumphant conqueror.