"Besides, even if any should be so poor, it is in their power, by means of the continual reading of the holy Scriptures which takes place here, to be ignorant of nothing contained in them."
Source: . NPNF1: Vol. XIV, Homilies on the Gospel according to St. John, Homily 11.1.
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.