Let’s start with one of my favorite quotes from John Calvin:
“Those who have learned from the mouth of Christ that all the hairs of his head are numbered (Matthew 10:30), will … hold that all events whatsoever are governed by the secret counsel of God.”
If I say to you, “Your days are numbered”, I could be saying no more than that I know exactly how long your life will last. I could also be threatening it. That is much like what Calvin wants the Lord to have said: that God personally determines the number of hairs on our heads. And if God exercises personal control over something so miniscule and insignificant, then he surely exercises personal control over all other matters in the universe both great and small.