We do so because we know that the one who raised up Jesus will also raise us up with Jesus and will bring us with you into his presence.

This power he exercised in Christ when he raised him from the dead and seated him at his right hand in the heavenly realms

Moreover if the Spirit of the one who raised Jesus from the dead lives in you, the one who raised Christ from the dead will also make your mortal bodies alive through his Spirit who lives in you.