According to the dispensation of God - The arrangement which God has made. That is, he designed that the gospel should be preached to the Gentiles, and, in accordance with that arrangement, he has called me to be a minister. Notes, Ephesians 3:2.
To fulfil the word of God - Margin, “fully to preach.” The Greek is, “to fill up the word of God;” the meaning is, “fully to teach and promulgate the gospel;” compare the notes at Romans 15:19.