Matthew 13:34 All these things Jesus said to the crowds in parables; indeed, he said nothing to them without a parable. 35 This was to fulfill what was spoken by the prophet: "I will open my mouth in parables; I will utter what has been hidden since the foundation of the world."
Jesus spoke in parables to fulfill what was spoken by the prophet. We look back to Matthew 13:10-13 to understand why Jesus spoke in parables. Parables reveal truth in everyday life events, but only to those who are willing to know the truth. The Jewish leaders were closed to knowing the truth, but the disciples, those prepared by John's baptism of repentance (see Luke 7:29-30), wanted to know the truth. God reveals truth to the people who want to know the truth and know their need of it (see John 7:17; 1 Corinthians 2:12)
Psalm 78:2 is quoted in Matthew 13:35. The prophet was the psalmist. The parables were dark sayings to those who didn't desire to do God's will, but were memorable truths made clear to those who desire to do God's will. Psalm 78:1-8 is about revealing truth to the next generation within each family. The best way to teach truth to a generation is parents teaching children. Both parents are to be doing this (Proverbs 6:20), but the father is given the primary responsibility to make sure this happens, as Psalm 78:5 makes clear. We see in the church today that the men are reluctant to take on their God-given responsibility preferring to leave it to the women. This needs to change. Every household that has a man needs to have that man take on his responsibility to impart truth to his family. Of course, the man will need to learn the truth first and this is done by a systematic study of the Bible done over the course of his life. All benefit when the man of the family takes on this responsibility. Of course, if the man fails to fulfill his responsibility the rest of the household still needs to be learning God's word. If one person doesn't fulfill his responsibility it doesn't remove the responsibility of everyone else, it only makes fulfilling that responsibility harder - but the Lord will pour out more grace.
Two questions. Are you willing to do God's will? Are you fulfilling your family responsibility? Psalm 78:8 shows the disastrous consequences if the answers are no, "a stubborn and rebellious generation." Psalm 78:7 reveals the results if the answers to the questions are yes, "so that they should set their hope in God and not forget the works of God, but keep His commandments." What type of generation is being raised up across America? What can you do to change the trend? Ask the Lord. Search the Scriptures. Take action.