What does Titus 3:8 mean?
Here, Paul refers to the poetic statement running from verses 4–7 as "trustworthy." Salvation by grace through faith was Paul's core teaching. He had personally experienced God's grace on the road to Damascus (Acts 9). Paul knew his changed life was not the result of his many works as a devout Jew, but was the result of God's grace (Ephesians 2:8–9).Paul told Titus to "insist," or demand, these teachings. These were not preferences, but core points of the earliest Christian church. The purpose of holding to these foundations was to cause believers to make a purposeful commitment to doing good deeds. These good works do not earn salvation; good works are the result of salvation. A person changed by God will seek to live for Him.
Paul affirmed that these things were "beneficial," or "profitable," for all people. This is not meant in the sense of money, but that healthy, sound doctrine was beneficial to the church. By comparison, the unhealthy teachings of the false teachers on Crete were poisonous.