The growing seed teaches that God's kingdom grows through processes humans do not fully control.

Mark 4:26–29

²⁶And he said, So is the kingdom of God, as if a man should cast seed into the ground;

²⁷And should sleep, and rise night and day, and the seed should spring and grow up, he knoweth not how.

²⁸For the earth bringeth forth fruit of herself; first the blade, then the ear, after that the full corn in the ear.

²⁹But when the fruit is brought forth, immediately he putteth in the sickle, because the harvest is come.