Whether the farmer realizes it or not, when he plants his crops, he is relying on the mercy of God for his crops to grow. There must be the right amount of rain and sun at the right time, as well as many other factors, otherwise the crops will fail. When I think about what a farmer must have been like, especially in Paul Harvey's day, I see a God-fearing man. Their wives must have been God-fearing women. Their lives were totally dependent on God and I believe they knew that. Our lives are totally dependent on God and His mercy...but...do we know that? Our salvation is totally dependent on God. We don't have the power to make the sun shine and we don't have the power to make the rain fall. We certainly don't have the power to save ourselves.
ROMANS1:20...For since the creation of the world God’s invisible qualities—his eternal power and divine nature—have been clearly seen, being understood from what has been made, so that people are without excuse.
While the revelation of God in nature is not sufficient to save a man, when rejected, it is sufficient to condemn him.