Apparently Paul introduced Christianity in Crete when he and Titus visited the island, after which he left Titus there to organise the converts. Paul sent the letter with Zenas and Apollos, who were on a journey that took them through Crete, to give Titus personal authorization and guidance in meeting opposition, instructions about faith and conduct, and warnings about false teachers. This is the last of the “Pastoral Epistles.”
This epistle chiefly contains directions to Titus concerning the elders of the Church, and the manner in which he should give instruction; and the latter part tells him to urge obedience to magistrates, to enforce good works, avoid foolish questions, and shun heresies. The instructions the apostle gave are all plain and simple. The Christian religion was not formed to answer worldly or selfish views, but it is the wisdom of God and the power of God.
Matthew Henry