Once God has all our heart (mind and might), and once we understand that we need to be ready to teach what God has put there at all times, (this starts first within us individually, then in our homes where primary influence should be), the question becomes, "What's next?"
Hear, O Israel: The Lord our God, the Lord is one. Deut. 6:4
The message isn't just for individuals. It isn't just for families. It is for God's people. In the Old Testament, the people of God were referred to nationally as "Israel". When Moses spoke these words, he was addressing the people of God as a whole. As we move through redemptive history and get into the New Testament with Jesus, the "people of God" expand beyond the borders of Israel, and now we call them "the church".
So, now the church has some responsibility. But what is it? It's the same as for the individual. Love the Lord your God with all your heart/soul/might, and be ready to talk about it at any time. Why include the church in this conversation? Because the people of the church are in a unique position to influence each other and the community in which they are located. And that is what this is really all about; community. Parents should be the primary influence of their children, but not the only influence. It takes the church to create a culture where faith can thrive. This is part of what discipleship is about.
So lesson #3 for this Deuteronomy 6 revisit is: Learning to live out faith happens best and most practically within the community of the church.