"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.”
This is a sacred part of the Jewish liturgy and one Jesus undoubtedly recited himself, as a Jew. Except Christians have adopted it to interpret the word "Lord" to mean Jesus, while for Jews, it maintains its original meaning referring to God. This prayer is basic to Judaism, going back a thousand years before Jesus' time. When you see a mezuzzah on the doorway of a Jewish home, this prayer is on a piece of parchment inside. Jews touch their fingers to the mezuzzah, then touch their fingers to their lips, an action meant to help them literally do what the prayer asks and remember the commandments and be faithful to them.
"Thou shalt love ..." is only the first part of three parts that are considered part of the Shema ("Hear oh Israel, the Lord our God, the Lord is One"). If anyone is interestested, the other two parts can be found in a Conservative prayerbook. The Reform movement took out the middle part because it was too stern -- referred to what happens if you do not follow the commandments (i.e. your fields will be barren, etc.). Typical liberal response!!! Anyway, the third part refers to the wearing of the fringes, which is what you see hanging out of Orthodox men's shirtsleeves. Before Judaism, fringes were reserved only for the elite and the wealthy, forbidden to others. Jews wear the fringes in a similar way they touch the mezuzzah -- to remind them to carry out God's commandments.