Murray on Barth's Universal Reconciliation

"unless exegesis of Paul is evacuated completely at the most vital point, this means that all men without exception must be ultimately  the beneficiaries of that grace which reigns through righteousness unto eternal life (5:21). Barth cannot hold to universalism at one point in the relationship to Christ without carrying out the implications for the ultimate salvation of all men. For if there is distributive universalism in the apodoses of verses 18 and 19, as Barth's interpretation demands, there must also be in the apodosis of verse 21, and the reign of grace through righteousness unto eternal life must embrace all men without exception. This is not Paul's teaching (cf. II Thess. 1:9; 2:10-14)..."

-John Murray
The Epistle to the Romans