Jamieson, Fausset & Brown

Whereunto--For the publication of which Gospel. I am appointed--Greek, "I was appointed." preacher--Greek, "herald." teacher of the Gentiles-- (Ti1 2:7). He brings forward his own example in this verse and Ti2 1:12, as a pattern for Timothy, as a public "preacher," an "apostle," or missionary from place to place, and a "teacher" in private instructing His flock with patient perseverance.