Only the Bible is the source of truth

"As we have seen, for Gordon Clark, there is no other source of divine, special revelation: The Bible alone is God's Word. Full authority is vested only in the Scriptures. As with the Westminster Assembly, Dr. Clark ruled out any other source of truth. The Apocryphal writings, the traditions of men (as per Rome), spiritual mysticism (as per Emanuel Swedenborg [1688 - 1772] and Mary Baker Eddy [1821 - 1910], existential experiences (as per Friedrich Schleiermacher [1768 - 1834] and Albrecht Ritschl [1822 - 1889]), and religious encounter theology (as per neo-orthodoxy), are all denied as a source of divine revelation. Not even councils and synods of orthodox churches hold sway over the sole source of truth: Holy Scripture." - W. Gary Crampton, The Scripturalism of Gordon H. Clark, Pg. 72