Timothy was Paul’s dearest disciple, his most steadfast associate. He was converted during the apostle’s first missionary journey. When Paul revisited Lystra, Timothy, though still very young (about twenty) joined him as a co-worker and companion. Thereafter, there existed between them a most intimate bond, as between father and son. St. Paul calls him his beloved child, devoted to him “like a son to his father” (Phil. 2:22). Of a kindly disposition, unselfish, prudent, zealous, he was a great consolation to Paul, particularly in the sufferings of his later years.
He also assisted the apostle in the establishment of all the major Christian communities and was entrusted with missions of highest importance. Timothy was with Paul during his first Roman imprisonment. Paul made his self-sacrificing companion bishop of Ephesus, but the finest monument left him by his master are the two canonical Epistles bearing his name.
— Excerpted from The Church’s Year of Grace, Pius Parsch