{According to the dispensation of God} (kata t(886e) oikonomian
tou theou). "According to the economy of God." An old word from
oikonome(935c), to be a house steward (oikos, nem(935c)) as in  Lu
16:2-4  1Co 9:17  Eph 1:9  3:9 . It was by God's stewardship that
Paul was made a minister of Christ. {To fulfil the word of God}
(pl(8872)(9373)ai ton logon tou theou). First aorist active infinitive
of purpose (pl(8872)o(935c)), a fine phrase for a God-called preacher,
to fill full or to give full scope to the Word of God. The
preacher is an expert on the word of God by profession. See
Paul's ideal about preaching in  2Th 3:1 .