Gregory the Great — on Ezek 2:9 (Homilies on Ezekiel, Book 1, Homily 9)

“"And I looked, and behold, a hand was sent to me, in which was a rolled-up book; and he spread it out before me, and it was written inside and outside." Just as the order of preachers is designated by the prophet, so the pages of Sacred Scripture are designated by the book which he received. Now the scroll is the obscure speech of Sacred Scripture, which is wrapped up in the profundity of its meanings, so that it may not easily be penetrated by the understanding of all. But the scroll is unrolled before the prophet, because the obscurity of sacred speech is opened before preachers. The hand of God had extended a rolled-up scroll when He was saying to the apostles: "The kingdom of heaven has become like a man who sowed good seed in his field. But while men were sleeping, his enemy came and sowed weeds among the wheat, and went away. And when the grass had grown and produced fruit, then the weeds also appeared," and the rest which your charity remembers even without my recounting it. But He unrolled the scroll which He had shown rolled up when He explained what He had spoken through riddles, saying: "He who sows the good seed is the Son of Man. The field is the world. The good seed, these are the sons of the kingdom; but the weeds are the sons of wickedness. The enemy who sowed them is the devil. The harvest is the consummation of the age, and the harvesters are angels. Therefore just as the weeds are gathered and burned with fire, so it will be at the consummation of the age." And so the rolled-up scroll is unrolled when what had been set forth obscurely is opened through the breadth of understanding. Truth unrolled this rolled-up scroll when He accomplished in His disciples what is written: "Then He opened their minds to understand the Scriptures."”