“This supernatural revelation, according to the belief of the universal Church, is contained both in unwritten Tradition, and in written Books, which are therefore called sacred and canonical because, ‘being written under the inspiration of the Holy Ghost, they have God for their author and as such have been delivered to the Church.’ This belief has been perpetually held and professed by the Church in regard to the Books of both Testaments; and there are well-known documents of the gravest kind, coming down to us from the earliest times, which proclaim that God, Who spoke first by the Prophets, then by His own mouth, and lastly by the Apostles, composed also the Canonical Scriptures, and that these are His own oracles and words - a Letter, written by our heavenly Father, and transmitted by the sacred writers to the human race in its pilgrimage so far from its heavenly country… uch and so great is the excellence and the dignity of the Scriptures, that God Himself has composed them.”
(Pope Leo XIII, Providentissimus Deus, no. 1)
“**y supernatural power, [The Holy Ghost] so moved and impelled [the sacred authors] to write - He was so present to them - that the things which He ordered, and those only, they first rightly understood, then willed faithfully to write down, and finally expressed in apt words and with infallible truth. Otherwise, it could not be said that He was the Author of the entire Scripture. Such has always been the persuasion of the Fathers. ‘Therefore,’ says St. Augustine, ‘since they wrote the things which He showed and uttered to them, it cannot be pretended that He is not the writer; for His members executed what their Head dictated.’ And St. Gregory the Great thus pronounces: ‘Most superfluous it is to inquire who wrote these things-we loyally believe the Holy Ghost to be the Author of the book. He wrote it Who dictated it for writing; He wrote it Who inspired its execution.’”
(Ibid., no. 20)
“You will not find a page in [St. Jerome’s] writings which does not show clearly that he, in common with the whole Catholic Church, firmly and consistently held that the Sacred Books - written as they were under the inspiration of the Holy Spirit - have God for their Author, and as such were delivered to the Church. Thus he asserts that the Books of the Bible were composed at the inspiration, or suggestion, or even at the dictation of the Holy Spirit; even that they were written and edited by Him. If we ask how we are to explain this power and action of God, the principal cause, on the sacred writers we shall find that St. Jerome in no wise differs from the common teaching of the Catholic Church. For he holds that God, through His grace, illumines the writer’s mind regarding the particular truth which, “in the person of God,” he is to set before men; he holds, moreover, that God moves the writer’s will - nay, even impels it - to write; finally, that God abides with him unceasingly, in unique fashion, until his task is accomplished.”
(Pope Benedict XV, Spiritus Paraclitus, no. 8f)**