The paramount command, the heart and soul of Torah, was: Dt 6:5 "You shall love the Lord your God with all your heart, and with all your soul, and with all your might. And these words which I command you this day shall be upon your heart; and you shall teach them diligently to your children, and shall talk of them when you sit in your house, and when you walk by the way, and when you lie down, and when you rise. And you shall bind them as a sign upon your hand, and they shall be as frontlets between your eyes. And you shall write them on the doorposts of your house and on your gates."
The awesome power of this command is expressed in God's words. "These words … shall be upon your heart." They are to be written into our very heart and soul, so that God is in us at every moment of our lives. "You shall teach them diligently to your children." We are to teach our children from a very early age that God loves them, and that they are to love Him in return. "Talk of them when you sit in your house, and when you walk by the way, and when you lie down, and when you rise." It is not enough to love God quietly in our heart and to teach this quiet love to our children; we are to proclaim God all day every day. "You shall bind them as a sign upon your hand." It is not enough to proclaim God in words, we must proclaim Him in the work of our hands as well. "They shall be as frontlets between your eyes." We are to concentrate on God's words to the exclusion of all else. "You shall write them on the doorposts of your house and on your gates." We should proclaim God's glory even to passing strangers. God gave us an example of how we are to know, love and serve Him by sending His Son to visit with us, to live a life focused constantly on His heavenly Father, to sacrifice His earthly life that God and man might be reconciled, and to nourish our souls with His own body, blood, soul and divinity.
.... Martin K. Barrack The Second Exodus
Phylacteries, Called in Hebrew: T’FILLIN
When Jewish men pray, they wear two boxes containing Scriptures. One is worn on the forehead, and the other is strapped to the left biceps with a long leather strap (see illustration above). The verses of Scripture inside the boxes are: Exodus 13:1-10, 11-16; Deuteronomy 6:4-9; and Deuteronomy 11:13-21. The boxes are called t’fillin (@yLipiTi) in Hebrew. The word t’fillin is usually translated into English as "phylacteries." The t’fillin are two leather boxes containing these handwritten Scriptures. One of the leather boxes is bound on the left arm (with the box inside the biceps next to the heart). It is bound (see above) by black leather straps which are wrapped seven times toward the hand, then wrapped upon the hand to form the Hebrew word Shaddai (yd'v'). The second one is placed on the head so that the box lays upon the forehead (next to the mind). The Jews’ placement of the Scriptures in t’fillin is a clear prayer lesson for Christians showing us that God wants His Word to be written in our hearts and in our minds.