Slave, not Lord

2Cor. 4:5 Οὐ γὰρ ἑαυτοὺς κηρύσσομεν ἀλλὰ Ἰησοῦν Χριστὸν κύριον, ἑαυτοὺς δὲ δούλους ὑμῶν διὰ Ἰησοῦν.
2Cor. 4:5 For what we proclaim is not ourselves, but Jesus Christ as Lord, with ourselves as your servants for Jesus’ sake.

In the Word Biblical Commentary, Ralph Martin points out the neat contrast between kurios (lord) and doulos (slave): Paul proclaims himself not as kurios but doulos.