David says: "o Lord, my helper and my redeemer". [He is] 'Lord' as maker and creator, and 'helper' as one who has given the aid of the law: for law, he says, he has given with a view to aid. And [he is] 'redeemer' as one who ransoms [us], by the regeneration of baptism, from [our] former corruptibility and redeems [us] from the servitude of demons and grants incorruption and inmortality.[1]
[Note] that a)fedrw/n ["privy"] and lutrw/nwn [are] vulgar. And look under a)fedrw/n.[2]