In Christ’s resurrection a new age came into existence! Why do Christians need to orient their whole selves around this new reality?

Some hear Jesus’ teaching and love it, and their lives are transformed for the better by it. Others hear it only reluctantly and remain diamond-hard against it. What makes the difference?

The resurrection of Christ makes the believer’s resurrection necessary. How is the day of firstfruits in the Old Testament related to every Christian’s certain future resurrection?