Catholic Answers Senior Apologist Jimmy Akin explains the circumstances behind the development of the Old Testament canon.
Jimmy Akin was born in Texas and grew up nominally Protestant. At age 20 he experienced a profound conversion to Christ. Planning on becoming a Protestant pastor or seminary professor, Jimmy started an intensive study of the Bible, but the more he immersed himself in Scripture, the more he found...
"It is the peculiarity of progress for a thing to be developed in itself; and the peculiarity of change, for a thing to be altered from what it was into something else."
~ Vincent of Lerins, Saint, noting the essential difference between development and alteration of the deposit of faith, over 1,000 years before Protestantism radically altered the face of Christianity. (Commonitorium, I, 23; see P.L., L). (see "Science and the Church")