Torah transforms the yetzer hara

איתא בעצרת אית בי' ביטול יצה"ר וזהו שאמרו אין לך בן חורין אלא העוסק בתורה חירות מן יצה"ר כמו שהי' בשעת קבלת התורה דכתיב מי יתן והי' לבבם זה להם כו' ב' יצרים.

It is taught that on Atzeres there is in it the nullification of the yetzer hara; and this is what they said, "you have no free man except one who occupies himself with Torah" — freedom from the yetzer hara, as it was at the time of Kabbalas HaTorah, of which it is written, "Who would grant that this heart of theirs be theirs..." — hinting at the two yetzarim.

Shavuos ("Atzeres") carries the power to nullify the yetzer hara. Chazal's teaching that only one engaged in Torah is truly free means freedom from the yetzer hara — as at Matan Torah. The pasuk's wording "levavam" (with a double letter beis) alludes to the two inclinations, hinting that even then the second yetzer was not fully erased.

וכן אומרים ותלמדם חקי חיים לעשות רצונך בלבב שלם הוא ב' לבבות כן תחננו ותלמדנו.

And likewise we say, "and You taught them statutes of life, to do Your will with a whole heart (b'leivav shaleim)" — this too is "two hearts" — "so be gracious to us and teach us."

In davening we ask to serve Hashem "b'leivav shaleim," again spelled with a double beis, hinting at the two hearts; the request is that through Torah both inclinations be turned to serving Hashem with a whole, unified heart.

ובכח קבלת התורה שמתעורר בכל יום יש להתחזק נגד היצה"ר כמ"ש חז"ל משכהו לביהמ"ד אם אבן הוא נימוח.

And by the power of Kabbalas HaTorah that is reawakened every day, one can strengthen himself against the yetzer hara, as Chazal said, "drag him to the beis hamidrash — if he is stone, he will dissolve."

The strength of receiving the Torah is renewed daily, empowering us to overcome the yetzer hara; Chazal's prescription is to pull the inclination into the study hall, where even a "stone" of resistance melts away.

וע"ז כתיב והיו הדברים כו' מצוך היום על לבבך ב' לבבות.

And concerning this it is written, "and these words... which I command you today shall be upon your heart (levavecha)" — "two hearts."

The Shema's word "levavecha," again with the doubled beis, teaches that the Torah's words are to rest upon both hearts — both inclinations are to be enlisted in avodas Hashem.

ובכל יום יהיו בעיניך כאלו היום ניתנו.

And each day they should be in your eyes as though they were given today.

The word "today" teaches that the Torah must feel freshly given each day, so its power against the yetzer is ever renewed.

ומכש"כ בחג השבועות אנכי מצוך היום ממש יכולין לבטל גם היצה"ר אל עבודת הבורא וזה הטעם חמץ בשתי הלחם.

And all the more so on Chag HaShavuos, "I command you today" literally — one can even subjugate the yetzer hara itself to the service of the Creator; and this is the reason for the leaven (chametz) in the two loaves.

On Shavuos the "today" of Sinai is literally present, granting the power not merely to suppress but to transform the yetzer hara into a tool for avodah. This is why the shtei ha'lechem brought on Shavuos contain chametz — the "leaven" of the yetzer hara itself is elevated and offered.

וכ' וידעת היום והשבות אל לבבך כי דעת במוח והעבודה היא בלב כמ"ש חז"ל עבודה שבלב זו תפלה.

And it is written, "and you shall know today and bring it back to your heart" — for da'as is in the mind, while the avodah is in the heart, as Chazal said, "the service of the heart, this is tefillah."

Knowledge begins in the mind ("you shall know") but must be drawn down into the heart ("return it to your heart"), for the real avodah — prayer — is the service of the lev.

וע"י הדעת צריכין להמשיך הלב.

And through da'as one must draw down the heart.

The mind's da'as is the means by which we lead and pull the heart toward serving Hashem.

ולכן ק"ש קודם תפלה ואין עומדין להתפלל אלא מתוך דברי תורה.

Therefore Krias Shema precedes tefillah, and one only stands to daven out of words of Torah.

This is the order of davening: the Torah-knowledge of Shema (mind) comes first, and only from divrei Torah does one rise to the heart-service of tefillah.

וכ"כ לכל אשר יקראהו באמת אין אמת אלא תורה.

And so it is written, "to all who call upon Him in truth" — and there is no "truth" except Torah.

Calling upon Hashem "be'emes" means calling out of Torah, for Torah is the emes that gives prayer its truth.

וגם בקבלת התורה כתיב תעבדון את האלקים על ההר הזה.

And also at Kabbalas HaTorah it is written, "you shall serve God upon this mountain."

Even the giving of the Torah was framed as leading to avodah — "you shall serve" — showing that Torah-knowledge is meant to issue in the service of the heart.

וכ"כ וירא העם כו' ויעמדו מרחוק ואמרו חז"ל עמידה זו תפלה:

And so it is written, "and the people saw... and they stood from afar," and Chazal said, "this standing (amidah) is tefillah."

At Sinai the people "stood" — and Chazal read "amidah" as prayer, teaching that the revelation of Torah culminated in the standing service of tefillah, the avodah of the heart.

Summary: Shavuos ("Atzeres") empowers the nullification — and even the transformation — of the yetzer hara, for true freedom is found in Torah. The repeated doubled "leiv/levav" hints at two inclinations, both of which Torah enlists in serving Hashem with a whole heart; this is why the two Shavuos loaves contain chametz. Torah-da'as begins in the mind but must be drawn into the heart, where the real avodah of tefillah lives — hence Shema precedes the Amidah, and even Sinai's revelation culminated in "standing," which is prayer.