Everyone says follow your heart. Why does this verse say not to?
The verse says: do not stray after your heart and your eyes. That sounds like the opposite of what you hear everywhere. First, notice what it does not say. It does not say to have no feelings. The verb means to scout or hunt around, the same verb used for the spies. So the verse is about going after your feelings, not about having them.
A midrash called the Sifrei sees a second reason for the verse. The book of Kohelet (Ecclesiastes) says: "Rejoice, young man, in your youth... walk in the ways of your heart and the sight of your eyes." Rabbi Yishmael says that could sound like permission to do whatever you want, so the Torah says: do not stray after your hearts. The same Kohelet verse ends: "But know that for all these God will bring you to judgment."
The Gemara hears two different pulls in the two words. "After your hearts" is wrong ideas about God, proved by "the fool says in his heart, there is no God." "After your eyes" is desire, proved by Shimshon (Samson, the strongman of the Book of Shoftim), who said of a woman: "Take her for me, because she is right in my eyes." The last words, "which you go astray after," are the pull toward worshipping other things.
The Sefer HaChinukh (a book from Spain in the 1200s that explains each mitzvah) keeps it realistic. A wrong idea or an urge will sometimes show up. The commandment is about what you do next: cut the thought short and turn your mind to what it calls the true and good ways of the Torah. It adds that the line is hard to draw, because a person cannot help seeing or thinking more than he should at times.
So the sources do not ask for an empty heart. They ask that it not be the one steering.
Bamidbar 15:39,Rashi on Bamidbar 15:39,Sifrei Bamidbar 115,Kohelet 11:9,Berakhot 12b,Sefer HaChinukh 387I never chose to be rescued from Egypt. Why would that mean I owe anything?
The paragraph ends: "I am Hashem your God, who took you out of Egypt to be your God." It can sound like a bill. You were rescued, so now you owe. And you were not even in Egypt. The sources themselves raise the complaint that this was forced on us.
Rashi (the classic Torah commentator), quoting the Sifrei, reads the phrase: "On this condition I redeemed you, that you accept My decrees."
The Sifrei tells a parable. A king's friend had a son who was captured. The king bought him back as a servant, not as a son, so that if the boy refused an order, the king could say: you are my servant. When the boy balked at carrying the king's things to the bathhouse, the king took out the deed. So too, God redeemed Israel, and when commands like Shabbat, tzitzit and tefillin came and Israel resisted, God said: this is why I redeemed you.
The Sifrei asks why the verse says "I am Hashem your God" a second time. Its answer: so Israel cannot say, we will neither do the commands nor take the reward. It imagines the elders of Israel telling the prophet Yechezkel (Ezekiel) that God sold them to the nations, so they are out of His hands. God's answer through him: "What you have in mind will never happen. With a strong hand, an outstretched arm and poured-out anger, I will be King over you." The Sifrei adds: against your will.
One teaching says that at Sinai God held the mountain over Israel like a barrel and said: accept the Torah, or this is your grave. Rav Acha bar Yaakov says that is a great protest against the Torah, since they were forced. Rava answers that they accepted it again in the days of Achashverosh (the Persian king in the Purim story). The Book of Esther says the Jews "confirmed and took upon themselves," which Rava reads as confirming what they had been forced to accept.
The sources offer a rescue with strings attached, and a later moment when the people chose it again.
Rashi on Bamidbar 15:41,Sifrei Bamidbar 115,Yechezkel 20:32-33,Shabbat 88a,Esther 9:27Why is a paragraph about strings on clothes part of Shema?
Shema has three paragraphs. The first is about loving God. The second is about keeping the commandments. The third is about threads on the corners of a garment. The Gemara asks the question you might ask: why was this one chosen?
Rabbi Yehuda bar Chaviva answers with a list of what is packed into it: the mitzvah of tzitzit, the Exodus from Egypt, accepting the yoke of the commandments, and three more that the Gemara finds in the words about your heart, your eyes and going astray. Those are wrong ideas about God, a thought of sin, and a thought of worshipping something else.
The Gemara even shows where each one sits in the verses. The yoke of the commandments is in "and you will remember all the commandments of Hashem." The Exodus is in "who took you out." The other three come from the heart, the eyes and "go astray."
A second teaching explains the order. Rabbi Shimon bar Yochai says Shema is about learning, the second paragraph about teaching, and this one about doing. The Gemara objects that this is too neat, since the first paragraphs also tell you to teach and to do. Its fixed version: the first paragraph has learning, teaching and doing, the second has teaching and doing, and this one has only doing. So it comes last.
In the Gemara's list, then, the strings are more than a dress code. They carry the Exodus, the commandments, and three warnings about what pulls a person off course.
Berakhot 12b,Berakhot 14b