Chrysostom (349-407):"Tarry not, I entreat, for another to teach thee; thou hast the oracles of God. No man teacheth thee as they; for he indeed oft grudgeth much for vainglory’s sake and envy. Hearken, I entreat you, all ye that are careful for this life, and procure books that will be medicines for the soul. If ye will not any other, yet get you at least the New Testament, the Apostolic Epistles, the Acts, the Gospels, for your constant teachers. If grief befall thee, dive into them as into a chest of medicines; take thence comfort of thy trouble, be it loss, or death, or bereavement of relations; or rather dive not into them merely, but take them wholly to thee; keep them in thy mind.
This is the cause of all evils, the not knowing the Scriptures. We go into battle without arms, and how ought we to come off safe? Well contented should we be if we can be safe with them, let alone without them."
Source: NPNF1: Vol. XIII, Homilies on the Epistle of St. Paul to the Colossians, Homily 9.
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.