Scripture and Standards
To interpret in accordance with these standards does not mean that one ignores the Scriptures. It must be shown over and over again that the standards are based on the Scriptures. In addition to this, the systematic theologian has to go beyond the standards to see whether he can possibly find a more specific formulation of truths already spoken of in the standards, and whether he can find a formulation of truths of Scriptures not yet spoken of in the standards. In this way he may himself help in some small way the further implication of the church into the truth of Scripture. Creeds must be revised and supplemented from time to time. But it is not until systematic theology has progressed beyond the creeds that the creeds themselves can be revised.
Cornelius Van Til, An Introduction to Systematic Theology (The Presbyterian and Reformed Publishing Company: Phillipsburg, NJ, 1979), 4.