Large Catechism, Fourth Commandment--Martin Luther

"We must, therefore, impress this truth upon the young (Deuteronomy 6:7) that they should think of their parents as standing in God's place. They should remember that however lowly, poor, frail, and strange their parents may be, nevertheless, they are the father and mother given to them by God. Parents are not to be deprived of their honor because of their conduct or their failings. Therefore, we are not to consider who they are or how they may be, but the will of God, who has created and ordained parenthood."