St Augustine on the Scriptures

I turned to Augustine, Ep. 137 to Volusianus for Christology, and found this first:

For such is the depth of the Christian Scriptures, that even if I were attempting to study them and nothing else from early boyhood to decrepit old age, with the utmost leisure, the most unwearied zeal, and talents greater than I have, I would be still daily making progress in discovering their treasures; not that there is so great difficulty in coming through them to know the things necessary to salvation, but when any one has accepted these truths with the faith that is indispensable as the foundation of a life of piety and uprightness, so many things which are veiled under manifold shadows of mystery remain to be inquired into by those who are advancing in the study, and so great is the depth of wisdom not only in the words in which these have been expressed, but also in the things themselves, that the experience of the oldest, the ablest, and the most zealous students of Scripture illustrates what Scripture itself has said: “When a man hath done, then he beginneth.” (Ecclus. 18:6)

If I live long enough, I think somewhere in the list of books I want to write is one on the doctrine of Scripture according to the Fathers.