"Night and day, whether he sleeps or gets up, the seed sprouts and grows, though he does not know how."
As much as we work the land and sow seeds, there is a limit to what we can do. Can we make a seed grow? We may be able to provide the conditions that make it highly probable that the seed will grow, but some things can only be done by God, the actual act of growing and giving life. Most plants grow on their own without our help, whether we are sleeping or awake. God is always working to grow something.
And the whole process is a complete mystery. Science can observe its growth up close and tell us about things like mitosis and DNA, but such close scrutiny only tells us what this growth looks like, the actual mechanics of growth, not how it grows or why. God does that work, He who freely gives life.
So we partner with God, both harvester and grower, to obtain the crop at the designated time. We reap the life that God has grown night and day. We soften the hearts and sow the seed in them and pray God causes them to grow. In this way we can share in the joy of the harvest, together rejoicing over the life that the land has brought forth. What a wonderful God who allows us to delight with him in every new believer come to fruition!