As far as kosmos is concerned, it clearly was employed by the Holy Spirit to communicate that the narrow bounds of the OT have been abolished. Gods revelation and salvific blessing were at that time largely restricted to one nation, his peculiar people, whereas the world was left in darkness. You only have I known of all the families of the earth (Amos 3:2). Note also Ps 147:1920; Jer 10:25. But now (Eph 2:13), the cross-work of Jesus has universalized Gods redemptive grace. The Church is composed of Jew and Gentile. God is calling to himself a people who were not his people: the Gentiles (Rom 9:2426; 1 Pet 2:10). He is found by them who sought him not (Rom 10:20). Now, as opposed to then, repentance and remission of sins are to be preached to all nations (Luke 24:47). Disciples are to be made of all nations (Matt 28:1920). The gospel is the power of God to all who believe, both to Jew and Gentile (Rom 1:16). God is pouring out his Spirit on all flesh (Acts 2:17). They who once were without Christ, strangers, aliens, and without God or hope, have now been drawn near by the blood of Christ (Eph 2:1113). The radical nature of this glorious truth is witnessed in the Jewish response to Gentile salvation. According to Paul, they were filled with envy (Acts 13:4250). The Jews, he tells us, please not God, and are contrary to all men; forbidding us to speak to the Gentiles that they might be saved (1 Thess 2:1516). Yet salvation has come to the Gentiles to provoke them to jealousy (Rom 11:11; Acts 22:2122). It required a heavenly vision to convince Peter (Acts 1011). And note the response: Then hath God also to the Gentiles granted repentance unto life (Acts 11:18). This truth is part of the mystery kept secret in ages past: that the Gentiles should be fellow heirs, and of the same body, and partakers of the promise in Christ by the gospel (Eph 3:56).
The word kosmos, it would appear, was an especially appropriate term to utilize in order to express this idea that the saving grace of God had extended into every country, to all peoples, viewed not in terms of individualistic universality, an all without exception, but all without distinctionthat is, without regard for ethnic or geographical criteria.