Reason for these quotes outlined here.
"A rule of faith, or a competent guide to heaven, must be able to instruct in all the truths necessary for salvation. Now the Scriptures alone do not contain all the truths which a Christian is bound to believe, nor do they explicitly enjoin all the duties which he is obliged to practice. Not to mention other examples, is not every Christian obliged to sanctify Sunday and to abstain on that day from unnecessary servile work? Is not the observance of this law among the most prominent of our sacred duties? But you may read the Bible from Genesis to Revelation, and you will not find a single line authorizing the sanctification of Sunday. The Scriptures enforce the religious observance of Saturday, a day which we never sanctify.
The Catholic Church correctly teaches that our Lord and His Apostles inculcated certain important duties of religion which are not recorded by the inspired writers.[See John xxi. 25; II. Thess. ii. 14.] For instance, most Christians pray to the Holy Ghost, a practice which is nowhere found in the Bible.
We must, therefore, conclude that the Scriptures alone cannot be a sufficient guide and rule of faith because they cannot, at any time, be within the reach of every inquirer; because they are not of themselves clear and intelligible even in matters of the highest importance, and because they do not contain all the truths necessary for salvation."
-The Faith of Our Fathers