Matthew Poole's English Annotations on the Holy Bible - Deuteronomy 6:8
Thou shalt give all diligence, and use all means, to keep them in thy remembrance, as men ofttimes bind something upon their hands, or put it before their eyes, to prevent forgetfulness of a thing which they much desire to remember: compare Proverbs 3:3; Proverbs 6:21; Proverbs 7:3. See Poole "Exodus 13:16". read more
Matthew Poole's English Annotations on the Holy Bible - Deuteronomy 6:7
Teach them diligently, Heb. whet, or sharpen them, so as they may pierce deep into their hearts. This metaphor signifies the manner of instructing them, that it is to be done diligently, earnestly, frequently, discreetly, and dexterously. read more