Luther

…the Holy Ghost cannot remain outside. And when He comes He makes the heart joyful, willing, and gay, so that it freely goes and gladly and with good heart does all that is well-pleasing to God, and suffers what has to be suffered, and would gladly die. And the purer and greater the knowledge, the deeper grows the bliss and joy. Thus the Lord’s command is fulfilled and all is done that should be deon; and thus you are made just.—Sermons, 1523.