"Blessed be the God and Father of our Lord Jesus Christ, who according to His abundant mercy has begotten us again to a living hope through the resurrection of Jesus Christ from the dead” (1 Peter 1:3).
The resurrection of Jesus Christ is a major doctrine in Christianity. If Jesus didn’t arise, then everything He claimed to be is not valid. If He did arise, we have every reason to believe that all of His other teaching is valid.
Peter here affirms that it is through the resurrection that we can feel secure in taking advantage of the mercy of God that allows us to be born again and that also gives us confidence in the living hope of going to heaven to be with God someday.
The resurrection, then, is the keystone in the arch of Christianity. Since Jesus did arise from the grave, we have a firm spiritual foundation. We have the greatest incentive we could ever have for living the kind of life outlined in scripture and for being what God wants us to be.