Gresham Machen gave this advice to Harold Ockenga as he was beginning his ministry:
"The whole world is your province as a preacher of the Gospel of Christ. Be interested in the teachings of science, in literature, in philosophy, and art. Do not be content with a superficial study of the Holy Book, but be a scribe who has become a disciple of the Kingdom of God. Do not be content merely with a chance acquantance with the Book, but seek to study it in the light of the grand, exegetical tradition of the Christian Church. Then you will know that nothing, no hostility of the world, no adverse decisions of souls and bodies of the visible church, no defections, no hostility can ever separate you from the great heritage that God has given you and these people in this Book."
~from The Surprising Work of God, Garth M. Rosell