“Furthermore, the apostolic Christianity is preformative, and contains the living germs of all the following periods, personages, and tendencies. It holds up the highest standard of doctrine and discipline; it is the inspiring genius of all true progress; it suggests to  its peculiar problem with the power to solve it. Christianity can never outgrow Christ, bu it grows in Christ; theology cannot go beyond the word of God, but it must ever progress in the understanding and application of the word of God. The three leading apostles represent not only the three stages of the apostolic church, but also as many ages and types of Christianity, and yet they are all present in every age and every type.”  Philip Schaff, History of the Christian Church, p. 199.