“Luke’s account of this momentous incident in Acts 15 has been described as ‘the most crucial chapter in the whole book,’ since it is positioned both ‘structurally and theologically at the very heart’ of Acts. “The chapter describes the turning point of Luke’s story. The threat to the expansion of the gospel to Gentiles is not only dealt with, but is turned around so that the Christian mission now extends to western Asia and Europe (15:36–19:41). After the council the Jerusalem church is hardly mentioned in Acts. Once the decision has been made, there is no further mention of the Jerusalem apostles (apart from 16:4), and the focus of the book is on the irresistible progress of the gospel to 'the ends of the earth' through Paul.”
Andreas J. Köstenberger and Peter T. O’Brien, Salvation to the Ends of the Earth: A Biblical Theology of Mission, ed. D. A. Carson (Downers Grove, IL, 2001), 151.