“For God, who said, ‘Let light shine out of darkness,’ has shone in our hearts to give the light of the knowledge of the glory of God in the face of Jesus Christ.” (2 Corinthians 4:6)

Prior to coming to verse 6 in 2 Corinthians 4 there is verse 5, which reads, “For what we proclaim is not ourselves, but Jesus Christ as Lord, with ourselves as your servants for Jesus’ sake.” Paul is writing that we – those who believed, at that time, in Jesus Christ – were not proclaiming themselves as Lord but they were proclaiming Jesus as Lord. Apparently there was some discussion going around that these Christians were usurping the Lordship of Jesus in favor of elevating themselves among other people. Paul destroys this falsity as he writes that they are proclaiming Jesus as Lord and, as for the Christian’s status among other people, they are placed rightly as servants for everyone for the sake of Jesus.

Moving on from verse 5 one can see that Paul is continuing his line of thinking from verse 5 into verse 6 because of his use of the word for.