To ask about trinitarian missions on the face of it seems strange; almost like asking about a christological gospel — what other kind of gospel could there be? What other kind of faithful Christian missions can there be except one that is trinitarian? The other response I get: Trinitarian missions what is that, some new thing?
The gospels themselves reveal the trinitarian mission as the mission of the church. Luke takes two volumes to narrative it: with the coming of the Son in his gospel, and the coming of the Spirit and the sending of the Church in Acts. The Johannine “great commission” (as it were) records the trinitarian mission in two condensed verses, “Again Jesus said, ‘Peace be with you! As the Father has sent me, I am sending you.’ And with that he breathed on them and said, ‘Receive the Holy Spirit.’” (John 20:21-22). Matthew captures the trinitarian nature of missions in the Lord’s final mandate to the Church: “go and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit” (Matt. 28:19). A robust, biblically faithful, trinitarian theology is vital to the church and its mission.