The psalmist asks the people to listen: I will tell you things that I heard from my ancestors. I'll tell children about what the Lord can do and has done.
Not only history, not only the glorious deeds and wonders that the Lord did for them then. But also, how the Lord intended for them to respond. They are to remember the teaching and make sure that their children know about what God has done and what they are supposed to do.
What do we tell the children in our congregation about our own experiences with God? Do we notice when God notices us? How have we gotten through dangerous places? How did we know which way was the right way to go? Are our needs being satisfied?