2 Corinthians 2:13

He tells us, that when he came there, he was much troubled because he did not find his brother Titus; where the humility of this great apostle is considerable, in that he disdained not to call Titus (a person, though a minister, yet much inferior to him as an apostle) brother. Several reasons are given of Paul's trouble. That which is most probable is, that he did expect at Troas to have met with Titus come from Corinth, from whom he might more perfectly have understood the affairs of that church: not finding him there, he tells us he went forward into Macedonia; whither, after the uproar at Ephesus, he designed to go, (as we read, Acts 20:1), but went first into Greece, and stayed there three months, intending to come to Macedonia in his return, 2 Corinthians 2:3.