'In Christ' in the Bible

For God was very pleased to have all of [His] fullness dwell in Christ [See 2:9],

For even though I am absent [from you] in body, still I am present with you in spirit, rejoicing and observing [i.e., with my mind's eye] your orderly behavior and the firmness of your faith in Christ.

These things are [only] a shadow of future things, but the body [i.e., the real substance of things] belongs to Christ. [Note: The idea here is that the ritual observances of the Mosaic law were like shadows pointing to the reality of life in Christ].