The question of Karl Barth's attitude towards universalism has been a topic of debate since his own day. By examining a twofold two-way determination of the actuality of world-history in Christo that Barth construes in the actualistic hamartiology of CD IV/3, §70, I will contend that he does not describe the prospect of the final condemnation of humankind as an empty threat, even though the whole of his theological witness to Christ clearly testifies to universal salvation. This dialectical aspect of Barth's actualistic hamartiology leads to an attitude towards the apokatastasis that George Hunsinger aptly describes as ‘reverent agnosticism’.