Deuteronomy 6:21-23 Then shalt thou say unto thy son,…the Lord brought us out…the Lord showed signs and wonders…that he might bring us in, to give us the land.
Fathers (and all other adults) respond to God’s grace by teaching the Gospel to their sons (and their generation). There will be teaching opportunities to answer children’s questions: verse 20, “When your son asks you in time to come, ‘What mean these commandments?” Then you may answer: “Because God is good, because He saved us mightily, and because He wants us to enjoy a good life, He gave commandments to follow in response to Salvation.”
Parents and teachers find many opportunities to teach the Gospel in response to children’s questions and in daily conversations. For instance, rather than saying, “Because I said so!” Something like “Because Jesus loves you!” would be better. Saying good things about God always works better than saying bad things about people.
The meaning of the Commandments and the reason for obeying them needs to be taught, for the natural man rebels against rules, and he does not naturally know the power of the Gospel for living a good life. God loves you and saves you; therefore, you will do these things. Life is happier when we are reminded of the gospel again and again. We respond by telling that gospel.