Pseudo-Chrysostom
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.
(Vict. Ant. e Cat. in Marc.) Or else He says, He knoweth not, that He may shew the free-will of those who receive the word, for He commits a work to our will, and does not work the whole Himself alone, lest the good should seem involuntary. For the earth brings forth fruits of its own accord, that is, she is brought to bear fruit without being compelled by a necessity contrary to her will. First the blade.