Deuteronomy 6:7

And thou shalt teach them diligently unto thy children, and shalt talk of them when thou sittest in thine house, and when thou walkest by the way, and when thou liest down, and when thou risest up.

Ver. 7. And thou shalt teach them diligently.] Heb., Thou shalt whet or sharpen them, as one would sharpen a stake when he drives it into the ground: or as one would set an edge upon a knife, by oft going over the whetstone. A learned Hebrician observes a near affinity between the word here used and another word that signifies to repeat, and inculcate the same thing. a Innuit studium et diligentiam, qua pueris praecepta Dei ineuleari debent, saith Vatablus. Children should be taught the principles that they understand not: (1.) That they might have occasion much to think of the things that are so much and commonly urged; (2.) That if any extremity should come, they might have certain seeds of comfort and direction to guide and support them; (3.) That their condemnation might be more just, if having these so much in their mouths, they should not get something of them into their hearts.

a Shanan, acuere, et Shanah, repetere, affines sunt.