Deuteronomy 11:18

Here, I. Moses repeats the directions he had given for the guidance and assistance of the people in their obedience, and for the keeping up of religion among them (Deu 11:18-20), which is much to the same purport with what we had before, Deu 6:6, etc. Let us all be directed by the three rules here given: - 1. Let our hearts be filled with the word of God: Lay up these words in your heart and in your soul. The heart must be the treasury or store-house in which the word of God must be laid up, to be used upon all occasions. We cannot expect good practices in the conversation, unless there be good thoughts, good affections, and good principles, in the heart. 2. Let our eyes be fixed upon the word of God. "Bind these words for a sign upon your hand, which is always in view (Isa 49:16), and as frontlets between your eyes, which you cannot avoid the sight of; let them be as ready and familiar to you, and have your eye as constantly upon them, as if they were written upon your door-posts, and could not be overlooked either when you go out or when you come in." Thus we must lay God's judgments before us, having a constant regard to them, as the guide of our way, as the rule of our work, Psa 119:30. 3. Let our tongues be employed about the word of God.

— Matthew Henry's Concise Commentary (public domain)

lay up these my words in your heart and in your soul, and bind them--(See on Deu 6:1).

— Jamieson-Fausset-Brown Commentary (public domain)