Our knowledge of God's will is not something over which we ourselves dispose, but it depends solely upon the grace of God, and this grace is, and requires to be, new every morning. That is why this proving or examining of the will of God is so serious a matter. The voice of the heart is not to be confused with the will of God, nor is any kind of inspiration or any general principal, for the will of God discloses itself ever anew only to him who proves it ever anew.