Pseudo-Jerome
Catena Aurea · Markusevangelium 4
And he said, So is the kingdom of God, as if a man should cast seed into the ground; And should sleep, and rise night and day, and the seed should spring and grow up, he knoweth not how. For the earth bringeth forth fruit of herself; first the blade, then the ear, after that the full corn in the ear. But when the fruit is brought forth, immediately he putteth in the sickle, because the harvest is come.
For the seed is the word of life, the ground is the human heart, and the sleep of the man means the death of the Saviour. The seed springs up night and day, because after the sleep of Christ, the number of Christians, through calamity and prosperity, continued to flourish more and more in faith, and to wax greater in deed.