Justin Martyr (wrote after 151):
"Moreover, I would wish that all, making a resolution similar to my own, do not keep themselves away from the words of the Savior. For they possess a terrible power in themselves, and are sufficient to inspire those who turn aside from the path of rectitude with awe; while the sweetest rest is afforded those who make a diligent practice of them."
Source:ANF: Vol. I, Dialogue of Justin, Chapter 8 .
For an excellent compilation of quotes of the Church fathers teaching on the primacy, sufficiency and ultimate authority of Scripture, get a copy of Holy Scripture:The Ground and Pillar of Our Faith Vol III- The Writings of the Church Fathers Affirming the Reformation Principle of Sola Scriptura.