Charles H. Spurgeon on Psalms 78:3

Which we have heard and known, and our fathers have told us. Tradition was of the utmost service to the people of God in the olden time, before the more sure word of prophecy had become complete and generally accessible. The receipt of truth from the lips of others laid the instructed believer under solemn obligation to pass on the truth to the next generation. Truth, endeared to us by its fond associations with godly parents and venerable friends, deserves of us our best exertions to preserve and propagate it. Our fathers told us, we hear them, and we know personally what they taught; it remains for us in our turn to hand it on. Blessed be God we have now the less mutable testimony of written revelation, but this by no means lessens our obligation to instruct our children in divine truth by word of mouth: rather, with such a gracious help, we ought to teach them far more fully the things of God. Dr. Doddridge owed much to the Dutch tiles and his mother's explanations of the Bible narratives. The more of parental teaching the better; ministers and Sabbath school teachers were never meant to be substitutes for mother's tears and father's prayers.