We always carry around in our [physical] bodies the [threat of] dying, as Jesus did [i.e., the apostles were constantly exposed to impending danger and death], so that the life of Jesus [i.e., His virtue, courage, faithfulness, etc.] may be demonstrated in our bodies [i.e., in the way we live] also.

So, from now on we will not regard any person by worldly standards, even though we [once] regarded Christ that way. But we will not regard Him [that way] anymore. [Note: Paul seems to be saying that before his conversion he viewed Christ on the basis of His family, His education, His position, etc., but since his conversion he does not view Him that way anymore].

in [speaking] the word of truth, in the power of God; by the weapons of righteousness for the right hand [like holding the sword to attack] and for the left [like holding the shield to defend],

Do not team up with unbelievers [i.e., in close relationships, such as marriage, etc.]. For what do righteousness and wickedness have in common? Or, what fellowship can light have with darkness?