to which I was appointed a preacher and an apostle (I am telling the truth in Christ, not lying), a teacher of the Gentiles in faith and truth.
Come to the knowledge of the truth ...  Some deductions of the most far-reaching nature come to view in a passage like this.  People do not already have "the knowledge of the truth," absolutely demanding that those who are to be saved must first be taught the truth.  This whole paragraph is keyed to Paul's command that prayers be offered in all congregations for all people.