A “tefillin” generally consists of two small boxes in which a person hand-writes four texts from The Word and then puts the texts into the boxes.
cf.
https://www.chabad.org/library/article_cdo/aid/1918251/jewish/What-Are-Tefillin.htm
The boxes are then bound to a person’s forehead and to their right arm.
The hand-written texts are the same in both boxes.
4 “Hear, O Israel: The Lord our God, the Lord is one!
5 You shall love the Lord your God with all your heart, with all your soul, and with all your strength.6 “And these words which I command you today shall be in your heart.
7 You shall teach them diligently to your children, and shall talk of them when you sit in your house, when you walk by the way, when you lie down, and when you rise up.
8 You shall bind them as a sign on your hand, and they shall be as frontlets between your eyes.
9 You shall write them on the doorposts of your house and on your gates.
If you are a devout Jew, in order to faithfully observe the words of Deuteronomy 6:4-9, you are called to remember God’s Word when you wake up in the morning, when you are praying in the morning, when you are sitting at home, and whether you are walking or even sleeping.
By tying the Tefillin boxes to your right hand and your forehead, you are remembering that you will speak God’s Word.
In Israel, it is illegal for any person to read a book while driving a car.
However, it is not illegal if they are reading the Word of God.
Meditating on the meaning of God’s Word with the tefillin, from morning time until a sleeping time, was a principle part of daily life for the Jewish people.
The use of tefillin is a part of Jewish culture which has survived for 2,500 years, since the time of the Babylonian captivity, and was alive and well even in 1948 when the land of Israel was reborn and the country began to rebuild itself.
It is precisely thanks to this “Tefillin education” that the brains of Jewish people are much more developed.
So, Tefillin is not just a recital of The Word, it can be said to be “the way of life itself” that always connects The Word with your mouth, heart, and constitution.