All whom we call masters are in the place of parents and must derive their power and authority to govern from them. Hence also they are all called fathers in the Scriptures, as those who in their government perform the functions of a father, and should have a paternal heart toward their subordinates. As also from antiquity the Romans and other nations called the masters and mistresses of the household patres- et matres- familiae, that is, housefathers and housemothers. So also they called their national rulers and overlords patres patriae, that is, fathers of the entire country, for a great shame to us who would be Christians that we do not likewise call them so, or, at least, do not esteem and honor them as such.
Large Catechism, Fourth Commandment, 142.