Deuteronomy 6:4-7

יהוה אלהינו יהוה אחד means, The Lord who is now our God and not the God of the other peoples of the world, He will at some future time be the One (sole) יהוה, as it is said, (Zephaniah 3:9) “For then I will turn to the peoples a pure language that they may all call upon the name of the Lord", and it is further said, (Zechariah 14:9) “In that day shall the Lord be One (אחד) and His name One" (cf. Sifrei Devarim 31:10).

Rashi on Deuteronomy 6:5:

ואהבת AND THOU SHALT LOVE [THE LORD] — Fulfil His commands out of love, for one who acts out of love is not like him (is on a higher plane than one) who acts out of fear. He who serves his master out of fear, if he (the master) troubles him overmuch, leaves him and goes away (Sifrei Devarim 32:1).

בכל לבבך [THOU SHALT LOVE THE LORD] WITH ALL THY HEART — The form of the noun with two ב instead of the usual form לבך suggests: Love Him with thy two inclinations (the יצר הטוב and the יצר הרע) (Sifrei Devarim 32:3; Berakhot 54a). Another explanation of בכל לבבך, with all thy heart, is that thy heart should not be at variance (i.e. divided, not whole) with the Omnipresent God (Sifrei Devarim 32:4).

ובכל נפשך AND WITH ALL THY SOUL — even though He take thy soul (even though you have to suffer martyrdom to show your love of God) (Sifrei Devarim 32:5; Berakhot 54a, Berakhot 61b).

ובכל מאדך AND WITH ALL THY MIGHT, i.e. with all thy property. You have people whose property is dearer to them than their bodies (life), and it is on this account that there is added, “and with all thy property" (Sifrei Devarim 32:6). — Another explanation of ובכל מאדך is: — Thou shalt love Him whatever measure (מדה) it may be that He metes out to thee, whether it be the measure of good or the measure of calamity. Thus also did David say, (Psalms 116:13 and 3) "If I lift up the cup of salvation, [I will call upon the name of the Lord]; If I find trouble and sorrow, [I will call upon the name of the Lord]”.

Rashi on Deuteronomy 6:6:

— What is the “love” that is here commanded? The next verse tells us: והיו הדברים האלה THESE WORDS [WHICH I COMMAND THEE] SHALL BE [UPON THINE HEART] — for thereby thou wilt arrive at a recognition of the Holy One, blessed be He, and wilt cleave to His ways (Sifrei Devarim 33:1).

אשר אנכי מצוך היום [THESE WORDS] WHICH I COMMAND THEE THIS DAY — this day— they should not be in thine eyes as an antiquated דיוטגמא which no one minds, but as one newly given which everyone gladly welcomes (Sifrei Devarim 33:2; cf. our first Note on p. 248 in the Silbermann edition of Exodus). — The word דיוטגמא in this Midrash signifies: a royal command committed to writing.

Rashi on Deuteronomy 6:7:

ושננתם AND THOU SHALT TEACH THEM DILIGENTLY — This word expresses the idea of being sharply impressed, the meaning being, that they should be impressed (familiar) in thy mouth, so that if a person asks you anything concerning them, you will not need to stammer (hesitate) about it, but tell him forthwith (Sifrei Devarim 34:1; Kiddushin 30a)

לבניך [AND THOU SHALT TEACH THEM DILIGENTLY] UNTO THY CHILDREN — These are the disciples. Everywhere do we find that disciples are termed בנים, as it is said, (Deuteronomy 14:1) “Ye are children (בנים) of the Lord your God”; and it says, (2 Kings 2:3), “The sons of (בני) the prophets who were in Bethel”. So. too, do we find in the case of Hezekiah that he taught Torah to all Israel and termed them בנים, as it is said, (II Chronicles 29:11), “My sons (בני) be not now negligent". And even as disciples are termed בנים, “children", so the teacher is termed אב, "father", as it is said, (2 Kings 2:12) that Elisha referred to his teacher Elijah by the words, "My father, my father, the chariot of Israel, etc." (Sifrei Devarim 34:4).

ודברת בם AND THOU SHALT SPEAK OF THEM — i.e. that your principal topic of conversation should be only about them: make them the principal, and do not make them of secondary importance (Sifrei Devarim 34:6).

ובשכבך AND WHEN THOU LIEST DOWN — One might think that this means: even if one lies down (retires to bed) in the middle of the day, and that ובקומך AND WHEN THOU RISEST UP means: even if you rise up in the middle of the night! It, however, states בשבתך בביתך ובלכתך בדרך WHEN THOU SITTEST IN THY HOUSE AND WHEN THOU WALKEST BY THE WAY: The Torah is thus speaking of the usual way of living, and this therefore means, the usual time of lying down and the usual time of rising up (cf. Sifrei Devarim 36:9).

“You have affirmed, this day, that the Lord is your God, and that you will walk in His ways and keep His laws and commandments, and listen to His voice.” And the subsequent verse states: “And the Lord has affirmed, this day, that you are His treasure, as He spoke to you, to keep His commandments” (Deuteronomy 26:17–18). From these two verses it is derived that the Holy One, Blessed be He, said to Israel: You have made Me a single entity [ḥativa] in the world, as you singled Me out as separate and unique. And because of this, I will make you a single entity in the world, and you will be a treasured nation, chosen by God.

You have made Me a single entity in the world, as it is stated that Israel declares God’s oneness by saying: “Hear, Israel, the Lord is our God, the Lord is One” (Deuteronomy 6:4). And because of this, I will make you a single entity in the world, unique and elevated with the utterance: “Who is like Your people, Israel, one nation in the land?” (I Chronicles 17:21) Consequently, the Holy One, Blessed be He, is glorified through the glory of Israel.

-- Talmud, Berachot 6a

Abaye said: As it was taught: “And you shall love the Lord your God” (Deuteronomy 6:5), which means that you shall make the name of Heaven beloved. How should one do so? One should do so in that he should read Torah, and learn Mishna, and serve Torah scholars, and he should be pleasant with people in his business transactions. What do people say about such a person? Fortunate is his father who taught him Torah, fortunate is his teacher who taught him Torah, woe to the people who have not studied Torah. So-and-so, who taught him Torah, see how pleasant are his ways, how proper are his deeds. The verse states about him and others like him: “You are My servant, Israel, in whom I will be glorified” (Isaiah 49:3).

But one who reads Torah, and learns Mishna, and serves Torah scholars, but his business practices are not done faithfully, and he does not speak pleasantly with other people, what do people say about him? Woe to so-and-so who studied Torah, woe to his father who taught him Torah, woe to his teacher who taught him Torah. So-and-so who studied Torah, see how destructive are his deeds, and how ugly are his ways. About him and others like him the verse states that people will say: “Men said of them: These are the people of the Lord, yet they had to leave His land” (Ezekiel 36:20).

--Talmud, Yoma 86a

From whence did Israel merit to recite the Shema? Our rabbis said: “The Holy One blessed Be, said to Israel: ‘ My children, all that I created, I created in pairs: heaven and earth are a pair, sun and moon are a pair, Adan and Eve are a pair, this world and the world to come, a pair, but my Glory is one and unique in the world.” Accordingly, from our declaring regarding: “Hear O Israel, the ETERNAL is our God the ETERNAL is One.” (Deuteronomy 6:4)

-- Deuteronomy Rabbah 2:37

One who sees conspicuous natural occurrences recites a blessing. For lightning, thunder, and gale force winds, manifestations of the power of the Creator, one recites: Blessed…Whose strength and power fill the world. For extraordinary (Rambam) mountains, hills, seas, rivers, and deserts, one recites: Blessed…Author of creation. Consistent with his opinion that a separate blessing should be instituted for each individual species, Rabbi Yehuda says: One who sees the great (Mediterranean) sea recites a special blessing: Blessed…Who made the great sea. As with all blessings of this type, one only recites it when he sees the sea intermittently, not on a regular basis. For rain and other good tidings, one recites the special blessing: Blessed…Who is good and Who does good. Even for bad tidings, one recites a special blessing: Blessed…the true Judge.

Similarly, when one built a new house or purchased new vessels, he recites: Blessed…Who has given us life, sustained us, and brought us to this time. The mishna articulates a general principle: One recites a blessing for the bad that befalls him just as he does for the good. In other words, one recites the appropriate blessing for the trouble that he is experiencing at present despite the fact that it may conceal some positive element in the future. Similarly, one must recite a blessing for the good that befalls him just as for the bad. The mishna states: And one who cries out over the past in an attempt to change that which has already occurred, it is a vain prayer. For example, one whose wife was pregnant and he says: May it be God’s will that my wife will give birth to a male child, it is a vain prayer. Or one who was walking on the path home and he heard the sound of a scream in the city, and he says: May it be God’s will that this scream will not be from my house, it is a vain prayer. In both cases, the event already occurred.

The Sages also said: One who enters a large city, the Gemara explains below that this is in a case where entering the city is dangerous, recites two prayers: One upon his entrance, that he may enter in peace, and one upon his exit, that he may leave in peace.

The mishna articulates a general principle: One is obligated to recite a blessing for the bad that befalls him just as he recites a blessing for the good that befalls him, as it is stated: “And you shall love the Lord your God with all your heart, with all your soul, and with all your might” (Deuteronomy 6:5). The mishna explains this verse as follows: “With all your heart” means with your two inclinations, with your good inclination and your evil inclination, both of which must be subjugated to the love of God. “With all your soul” means even if God takes your soul. “And with all your might” means with all your money, as money is referred to in the Bible as might. Alternatively, it may be explained that “with all your might” means with every measure that God metes out to you; whether it is good or troublesome, thank God.

-- Mishnah Berachot 9:1

Rabbi Meir says: From where is it derived that just as one recites a blessing over the good that befalls him he recites a blessing over the bad? The verse states: “That the Lord, your God gave you.” (Deuteronomy 8:10)“Your God” is a reference to the attribute of divine justice; your Judge, in whatever judgment that He judges you, whether it is a positive measure of goodness or a measure of calamity.

-- b. Berachot 48b

The Gemara asks: What does it mean: One is obligated to recite a blessing for the bad just as for the good? If we say this means that just as one recites a blessing for a positive event with the formula: Who is good and does good, so too one recites a blessing for a calamity with the formula: Who is good and does good, didn’t we learn in our mishna that over good tidings one recites: Who is good and does good, while over bad tidings one recites: Blessed…the true Judge? Rather, Rava said: The mishna’s statement was only necessary to instruct us to accept bad tidings with the same joy with which we accept good tidings, not to instruct with regard to which blessing to recite. Rav Aḥa said in the name of Rabbi Levi: What is the verse that alludes to this? “I will sing of loving-kindness and justice; unto You, O Lord, will I sing praises” (Psalms 101:1). Rav Aḥa explains: If it is loving-kindness, I will sing, and if it is justice, I will sing. I will thank God in song for the bad just as for the good. Rabbi Shmuel bar Naḥmani said: The proof is from here, as it is stated: “In God, I will praise His word; in the Lord, I will praise His word” (Psalms 56:11). The Gemara explains that In God, I will praise His word; that is the revelation of God’s attribute of benevolence, while: In the Lord, I will praise His word; that is the attribute of suffering; even if God brings suffering to bear upon me, I will still praise Him. Rabbi Tanḥum said: The proof is from here, as it is stated: “I will lift up the cup of salvation and call upon the name of the Lord” (Psalms 116:13), and: “I found trouble and sorrow, but I called upon the name of the Lord” (Psalms 116:3–4). And the Rabbis said: The proof is from here, as it is stated: “The Lord has given and the Lord has taken away; blessed be the name of the Lord” (Job 1:21).

-- b. Berachot 60b