This psalm serves as a teaching song, which could be used by fathers to teach their children. The LORD commanded that each generation instruct the next, so that no one is ignorant of who God is, and what he has done. The past is not just history. There are lessons in the past that can give guidance for the believer. The past can lead us to our LORD, where he wants to meet us in the present.
LORD, make us aware of who we are by showing us what we were.
Psalm 78