The third consideration is by far the most important of all, namely, the command of God, who through Moses urges and enjoins parents so often to instruct their children that Psalm 78 says: How earnestly he commanded our fathers to teach their children and to instruct their children’s children [Ps. 78:5–6]. This is also evident in God’s fourth commandment, in which the injunction that children shall obey their parents is so stem that he would even have rebellious children sentenced to death [Deut. 21:18–21]. Indeed, for what purpose do we older folks exist, other than to care for, instruct, and bring up the young? It is utterly impossible for these foolish young people to instruct and protect themselves. This is why God has entrusted them to us who are older and know from experience what is best for them. And God will hold us strictly accountable for them. This is also why Moses commands in Deuteronomy 32[:7], “Ask your father and he will tell you; your elders, and they will show you.”
It is a sin and a shame that matters have come to such a pass that we have to urge and be urged to educate our children and young people and to seek their best interests, when nature itself should drive us to do this and even the heathen afford us abundant examples of it. There is not a dumb animal which fails to care for its young and teach them what they need to know; the only exception is the ostrich, of which God says in Job 31 [39:16, 14] that she deals cruelly with her young as if they were not hers, and leaves her eggs upon the ground. What would it profit us to possess and perform everything else and be like pure saints, if we meanwhile neglected our chief purpose in life, namely, the care of the young? I also think that in the sight of God none among the outward sins so heavily burdens the world and merits such severe punishment as this very sin which we commit against the children by not educating them (Luther’s Works, v. 45 p. 353).