Once the seed is in the ground it just naturally comes forth the way God intended – but not immediately. First the blade, then the head, then the full grain in the head. Like everything else in God’s creation, it is progressive.
Likewise, we “do not know how” this Irresistible Kingdom continues to grow and develop, yet it persists in doing so. It really is irresistible. Eventually the harvest will come and we will see the end result. Only then will the magnitude of God’s infinite wisdom and the greatness of His Purpose be revealed in all its fullness.