{But now apart from the law} (
uni de ch(9372)is nomou). He
now (
uni emphatic logical transition) proceeds carefully in
verses  21-31  the {nature} of the God-kind of righteousness
which stands manifested (dikaiosun(8820)theou pephaner(9374)ai, perfect
passive indicative of phanero(935c), to make manifest), the
{necessity} of which he has shown in  1:18-3:20 . This God kind
of righteousness is "apart from law" of any kind and all of grace
(chariti) as he will show in verse  24 . But it is not a new
discovery on the part of Paul, but "witnessed by the law and the
prophets" (marturoumen(885c), present passive participle, hupo tou
nomou kai t(936e) proph(8874)(936e)), made plain continuously by God
himself.