Acts 28:31

Preaching the kingdom of God; making known the gospel, and urging men to embrace it. We are very incompetent judges as to the time, place, and condition in which we may be most useful. If Paul, during the two years of his confinement as a prisoner at Rome, not only preached the gospel to all who came to him, but as has been supposed, also wrote the epistles to the Ephesians, Philippians, Colossians, to Timothy and Philemon, and to the Hebrews, he may thus already have done more good than he could have done by being at liberty, and preaching the gospel to all who would hear him during his whole life.