Sola Scriptura
They have succeeded in convincing my judgment of in truth either by means of these canonical writings themselves, or by arguments addressed to my reason.
Augustine of Hippo, “Letters of St. Augustin,” in The Confessions and Letters of St. Augustin with a Sketch of His Life and Work, ed. Philip Schaff, trans. J. G. Cunningham, vol. 1, A Select Library of the Nicene and Post-Nicene Fathers of the Christian Church, First Series (Buffalo, NY: Christian Literature Company, 1886), 350