Charles H. Spurgeon on Psalms 78:7

That they might set their hope in God. Faith cometh by hearing. Those who know the name of the Lord will set their hope in him, and that they may be led to do so is the main end of all spiritual teaching. And not forget the works of God. Grace cures bad memories; those who soon forget the merciful works of the Lord have need of teaching; they require to learn the divine art of holy memory. But keep his commandments. Those who forget God's works are sure to fail in their own. He who does not keep God's love in memory is not likely to remember his law. The design of teaching is practical; holiness towards God is the end we aim at, and not the filling of the head with speculative notions.