Glossa Ordinaria — as excerpted in the Catena Aurea on Mark 4:30-34

“(non occ.) After having narrated the parable concerning the coming forth of the fruit from the seed of the Gospel, he here subjoins another parable, to shew the excellence of the doctrine of the Gospel before all other doctrines. Wherefore it is said, And he said, Whereunto shall we liken the kingdom of God?”