Dr. Douglas Grandon on the Inadequacy of Scripture Alone

Trying to understand what the Apostles taught and what the Church taught in the early centuries simply by reading the Bible is like trying to watch a baseball game through the knothole in the fence…Scripture was not intended to present a full witness to us of all that the Church taught, believed and practiced. (Scripture is) made up of fully authoritative, inspired writings, but incomplete. That’s why God gave Bishops to us, to sort all of this out over time, as different needs arose in the Church.

Dr. Douglas Grandon – The Journey Home

Jimmy Akin on Sola Scriptura and Private Judgment

So let us cast aside the false promise of “Just-me-and-my-Bible” Christianity, let us remove the crushing burden of telling every individual Christian, no matter how poor, uneducated, or illiterate, that he must be his own theologian and that his soul hangs in the balance, let us remove the hypocrisy Protestant pastors are forced into by the doctrine as they permit for themselves a right they prohibit for the members of their congregations, and let us be honest, with the Catholic Church, about the matter: Sola scriptura, and the absolute right of private judgment which it entails, is simply not God’s plan.

Jimmy Akin – Sola Scriptura and Private Judgment

Pope Paul VI on Sacred Scripture and Sacred Tradition, expounded and guarded by the Magisterium

It is clear, therefore, that in the supremely wise arrangement of God, sacred Tradition, sacred Scripture and the Magisterium of the Church are so connected and associated that one of them cannot stand without the others. Working together, each in its own way under the action of the one Holy Spirit, they all contribute effectively to the salvation of souls…this Magisterium is not superior to the Word of God, but is its servant. It teaches only what has been handed on to it. At the divine command and with the help of the Holy Spirit, it listens to this devotedly, guards it with dedication and expounds it faithfully.

Dei Verbum – Pope Paul VI

St. Irenaeus on the successors to Peter preserving the one true faith

The blessed apostles, then, having founded and built up the Church, committed into the hands of Linus the office of the episcopate. Of this Linus, Paul makes mention in the Epistles to Timothy. To him succeeded Anacletus; and after him, in the third place from the apostles, Clement was allotted the bishopric. This man, as he had seen the blessed apostles, and had been conversant with them, might be said to have the preaching of the apostles still echoing [in his ears], and their traditions before his eyes. Nor was he alone [in this], for there were many still remaining who had received instructions from the apostles. In the time of this Clement, no small dissension having occurred among the brethren at Corinth, the Church in Rome dispatched a most powerful letter to the Corinthians, exhorting them to peace, renewing their faith, and declaring the tradition which it had lately received from the apostles, proclaiming the one God, omnipotent, the Maker of heaven and earth, the Creator of man, who brought on the deluge, and called Abraham, who led the people from the land of Egypt, spoke with Moses, set forth the law, sent the prophets, and who has prepared fire for the devil and his angels. From this document, whosoever chooses to do so, may learn that He, the Father of our Lord Jesus Christ, was preached by the Churches, and may also understand the tradition of the Church, since this Epistle is of older date than these men who are now propagating falsehood, and who conjure into existence another god beyond the Creator and the Maker of all existing things. To this Clement there succeeded Evaristus. Alexander followed Evaristus; then, sixth from the apostles, Sixtus was appointed; after him, Telephorus, who was gloriously martyred; then Hyginus; after him, Pius; then after him, Anicetus. Soter having succeeded Anicetus, Eleutherius does now, in the twelfth place from the apostles, hold the inheritance of the episcopate. In this order, and by this succession, the ecclesiastical tradition from the apostles, and the preaching of the truth, have come down to us. And this is most abundant proof that there is one and the same vivifying faith, which has been preserved in the Church from the apostles until now, and handed down in truth.

Against Heresies III.3.3 by St. Irenaeus