We need to keep seeking things above (Col 3:1-4) -- His mind; character; and conduct. This is the hidden life -- not outward righteousness; but inner. 5 things to seek: (1) to understand the finished work of Christ (Heb 10:10-12; Joh 19:30; Col 2:10; Heb 4:1-16) -- Christ is seated; Be Seated!; (2) seek the reality of our union with Christ (Rom 6:4-5); (3) seek heavenly realities -- a higher plane and form of spiritual service -- bring the Kingdom into your world; (4) seek the abundant life (Joh 10:10; Rom 14:23; Gal 2:20; Phi 3:1-21); (5) seek separation from the world -- die to it (Col 3:5-9; the pattern Gen 2:17; Psa 22:1-6; 1Co 6:9-11). Summary of the hidden life: Seeking; Separation; and Sanctification.
Paul never met the Colossians but wrote to them from a Roman prison around 62 AD to counter misconceptions of his day. It magnifies the character of Jesus Christ more than any other book in the New Testament, and counters misconceptions of our day as well. The key verse may well be Col 1:18 "...that in all things, He might have preeminence."