Paul [Paulos]. Roman name [Paulus]. See on Ac 13:9 for the origin of this name by the side of Saul. Servant [doulos]. Bond-slave of Jesus Christ (or Christ Jesus as some MSS. give it and as is the rule in the later Epistles) for the first time in the Epistles in the opening sentence, though the phrase already in Ga 1:10. Recurs in Php 1:1 and [desmios] (bondsman) in Phm 1:1. Called to be an apostle [kletos apostolos]. An apostle by vocation (Denney) as in 1Co 1:1. In Ga 1:1 [kletos] is not used, but the rest of the verse has the same idea. Separated [aphOrismenos]. Perfect passive participle of [aphorizO] for which verb see on Ga 1:15. Paul is a spiritual Pharisee (etymologically), separated not to the oral tradition, but to God's gospel, a chosen vessel (Ac 9:15). By man also (Ac 13:2). Many of Paul's characteristic words like [euaggelion] have been already discussed in the previous Epistles that will call for little comment from now on.
