Because this life is transient and we already live in the new and eternal age restored in Christ (at least in part), our preoccupations are different to those bound to this world and life.
Here is Paul’s repacking of the Christmas gift in terms of the personal and corporate implications of God so loving the world that He gave His only begotten Son.
These exhortations are dependent upon the accomplishments of Christ in the first Advent, with the upshot that upon the final advent the faithful will stand “sanctified completely” and “blameless.” Be mindful of both, neglect neither.