When I went on a retreat to a monastery once, I sat looking out a window wondering what I should pray for. How many good Christians I have talked to who weren't sure what to pray for. Sometimes just a few minutes seems too long after we have made OUR list of requests, and then we quit. In other words, just stop and listen to what God is saying! It is not OUR minds that we are opening to the Lord. It is the mind of the Spirit that God has put within our heart. There is no course offered in our churches that can TEACH us how to pray in the Spirit. God is the only teacher.