Psalm 78:1-8 (ESV)
Give ear, O my people, to my teaching; incline your ears to the words of my mouth! I will open my mouth in a parable; I will utter dark sayings from of old, things that we have heard and known, that our fathers have told us. We will not hide them from their children, but tell to the coming generation the glorious deeds of the LORD, and his might, and the wonders that he has done. He established a testimony in Jacob and appointed a law in Israel, which he commanded our fathers to teach to their children, that the next generation might know them, the children yet unborn, and arise and tell them to their children, so that they should set their hope in God and not forget the works of God, but keep his commandments; and that they should not be like their fathers, a stubborn and rebellious generation, a generation whose heart was not steadfast, whose spirit was not faithful to God.
This psalm is credited to Asaph. It is referred to as a maskil, which many scholars consider a meditative or teaching song. It appears to have the purpose to teach and remind the Israelites of what God did for them in times past, so they can teach their children.
I believe it is good to look back at the blessings we have been given from time to time, not to focus on them at the expense of the present, but to refresh our memory of the faithfulness of God. God will continue to bless His children when we are submitted to His will.
This psalm goes on to speak of the rescue from Egypt, and their rebellion in the desert. It teaches the hearer about the troubles and the reason why the Israelites wandered in the desert for forty years. It was due to their rebellion and faithlessness. Yet it ends with the Lord choosing David to lead His people. It reminds us that when we are not faithful, yet the Lord will be. He will remember His promises. He does want us to repent of our sin. He will not bless when we are acting in sin. He will bless when we turn from our wicked ways.
So let us ponder our lives. Let us repent of our selfishness and sin. Let us turn to the Lord for His mercy is new every morning. May the God of the universe bring us to Himself. May He use us to teach others of His goodness.