JMNT(i)
30 What, then, shall we continue declaring? That [the] nations (ethnic multitudes; Gentiles; non-Israelites) – the ones not constantly pursuing (pressing forward rapidly after) rightwisedness (covenant inclusion which is right and fair relationship with equitable dealings in accord to the Way pointed out; a turning in the right direction on the Path) – overtook, seized and took-down this rightwisedness as a possession: yet [it is] a rightwisedness (a turning to equity and justice in the Way; = covenant membership and participation) that [is] forth from out of the midst of faith, trust and conviction (or: [Christ's] faithfulness)!
31 However Israel, habitually pursuing a Law which was rightwisedness (right and fair relationship with equitable dealings in accord to the way pointed out [to them]; right living on the path) did not precede [the others] into [that] principle or custom (or: did not outstrip or sooner arrive unto [such] a law or custom [other MSS add: which was justice and rightwised living]; = did not reach, ahead of other folks, what the Torah promised).
32 Through what cause (or: Why)? Because [it was] not forth from out of a source of faith, trust and conviction, but rather as from out of works (actions) as its source. They dash against, trip and stumble on (or: by) the Stone that caused the Stumbling-effect,
33 Just as it has been written, "Look and consider! I am repeatedly placing in Zion a 'Stone of Stumbling,' and a 'Rock of a trap-snare.' And the one habitually believing upon Him (or: It) will not continue being brought to shame, disgrace, or disappointment." [Isa. 28:16]