2 Reflect then how great an evil it is for us, who ought to live so purely as not even to need written words, but to yield up our hearts, as books, to the Spirit; now that we have lost that honor, and have come to have need of these, to fail again in duly employing even this second remedy. For if it be a blame to stand in need of written words, and not to have brought down on ourselves the grace of the Spirit; consider how heavy the charge of not choosing to profit even after this assistance, but rather treating what is written with neglect, as if it were cast forth without purpose, and at random, and so bringing down upon ourselves our punishment with increase.
But that no such effect may ensue, let us give strict heed unto the things that are written; and let us learn how the Old Law was given on the one hand, how on the other the New Covenant.
Source: Homilies on the Gospel of St. Matthew (New Advent)