And it shall be for a token upon thine hand, and for frontlets between thine eyes: for by strength of hand the Lord brought us forth out of Egypt.

This is the covenant that I will make with them after those days, saith the Lord, I will put my laws into their hearts, and in their minds will I write them;

COMMENTARY

And it shall be for a token upon thine hand, and for frontlets between thine eyes
The Ancient Israelites took strips of paper, wrote scriptures upon them, and bound them to their hands and foreheads. Yes, this practice was to help them remember the words, but the exact placement chosen by the Lord was meant to suggest something further. Upon the forehead to imply seeing the will of God wherever you look. Upon the hand to imply doing the work of God in all that you do.
The Israelites were being told to not just remember the words, but by the remembering be moved by them. Remembering God’s words is meant to color every aspect of our life, not be sequestered into a single meeting at church.

I will put my laws into their hearts, and in their minds will I write them
In this verse we are promised that God’s law will be written into our minds, suggesting that we remember the words of it always. But as with the Israelites of old, if we stop at remembering the words only we have only received half of the promise. For also we are told that the law is to be put into our hearts as well. We need to know the law, but we need to feel it, too. We need to remember its injunctions, but also its intent. We need to consider its structure, but also its joy.