Standards and Trust
Once these [confessional] standards or dogmas of the Church have been accepted, it goes without saying that a theologian who writes a work on systematics will write it in accordance with the interpretation given in those standards. To say that this hampers his freedom is to say that he has not himself freely adopted these creeds as a member of the church.
Cornelius Van Til, An Introduction to Systematic Theology (The Presbyterian and Reformed Publishing Company: Phillipsburg, NJ, 1979), 4.