There was an OT professor who taught young people that were preparing for the ministry. At the beginning of the class he would take off his coat and bow. He would bow to the class of his students. Some of his faculty members were upset at this gesture. And he said, "I bow to them because you never know which of them is going to be called of God to some great service."
The professor of course did not realize at that time that one of his students sitting there was Martin Luther, who later would establish the protestant reformation and have a huge impact on the development of the church.