Charles Ellicott Commentary Deuteronomy 6:7

"and thou shalt teach them diligently unto thy children, and shalt talk of them when thou sittest in thy house, and when thou walkest by the way, and when thou liest down, and when thou risest up." — Deuteronomy 6:7 (ASV)

And you shall teach them diligently. —The same Jewish commentator remarks that there should be no hesitation in answering anything that anyone might ask. Had this system of education been carried on from the first, the history of Israel would have been very different from what it is.