For it is a shame even to speak of those things which are done of them in secret.
The Greek order is, 'For the things done in secret by them it is a shame even to speak of.' The "for" gives his reason for 'not naming' (cf. Ephesians 5:3) in detail the works of darkness, whereas he describes definitely (Ephesians 5:9) 'the fruit of the light' (Bengel). I think the "for" expresses, Reprove them; for to speak of them in detail without reproving them is a shame (Ephesians 5:3). Thus "works of darkness" answers to 'things done in secret.' And 'even to speak of them' without reproving is opposed to 'even reprove them.'