Tzitzis refines the body as vessel

לפרשת ציצית במדרש אור זרוע לצדיק כו' זרע הקב"ה מצות שאין לך דבר שלא נתן בו מצוה כו'.

For the passage of tzitzis, in the Midrash: "Light is sown for the righteous" (Tehillim 97:11) — Hashem sowed mitzvos, for there is nothing in which He did not place a mitzvah.

The Midrash teaches that Hashem "sowed" mitzvos throughout creation, leaving nothing without a mitzvah attached to it.

הענין הוא כמו שהקב"ה מחדש בכל יום מעשה בראשית וכמו כן פנימיות החיות שהוא התורה וזהו ב' הברכות שקודם ק"ש כמ"ש במ"א.

The matter is: just as Hashem renews the act of Creation each day, so too [He renews] the inner life-force (penimiyus ha-chiyus), which is the Torah; and this is [the meaning of] the two blessings before Krias Shema, as written elsewhere.

Hashem daily renews both the outer world ("act of Creation") and its inner Torah-vitality — the two themes of the two berachos preceding Shema.

וכמו כן מתעורר ב' בחי' אלו בבנ"י ממש וזה שלא הניח דבר שלא נתן בו מצוה לישראל.

And likewise these two aspects are actually awakened within Bnei Yisrael, and this is [the meaning of] "He left nothing without placing in it a mitzvah for Yisrael."

Both the outer and inner renewals are aroused within Bnei Yisrael through the mitzvos Hashem embedded in everything.

וב' בחי' הנ"ל הוא תיקון הגוף והנשמה.

And these two aspects are the rectification of the body (guf) and the soul (neshamah).

The two dimensions correspond to refining the body and the soul respectively.

וטלית עם ציצית הוא התרוממות הגוף אור זרוע כמו נר מצוה שהציצית שקולה נגד כל המצות.

And the tallis with tzitzis is the elevation of the body — "light is sown," like "a mitzvah is a lamp" — for tzitzis is equivalent to all the mitzvos. (cf. Menachos 43b)

Wrapping the body in a tallis elevates the physical self; tzitzis, weighed against all mitzvos, sows this "light" into the body.

ופי' מו"ז שאלה המצות שאמרו ששקולים כו' הם מתקנים כל הרמ"ח איברים.

And my grandfather (the Chiddushei HaRim) explained that those mitzvos which they said are "equivalent [to all]" — they rectify all 248 limbs (ramach eivarim).

The Sefas Emes cites his grandfather: a mitzvah "equal to all mitzvos" is one that rectifies the entire body, all 248 limbs.

וכן רמז הטלית שמתעטף כל הגוף בו.

And so the tallis hints [at this], for the entire body is wrapped in it.

Wrapping the whole body in the tallis symbolizes the rectification of the whole body.

אחר כך ולישרי לב שמחה בחי' התפילין שמחה שמעולם שהוא בחי' תורת ה' בפיך.

Afterward, "and joy for the upright of heart" (Tehillim 97:11) — the aspect of tefillin, a joy that is "from the [higher] world," which is the aspect of "the Torah of Hashem in your mouth." (Shemos 13:9)

After the body is elevated by tzitzis comes tefillin, corresponding to the soul's joy and to the Torah — "the Torah of Hashem in your mouth."

ואיתא דבדח משום דתפילין קמנחנא כו'.

And it is taught [regarding a sage] that he was joyous because "I am wearing tefillin." (Berachos 30b)

The Gemara records a sage's special joy from wearing tefillin, reflecting this inner gladness.

שמקודם מסייע הציצית לישרת הלב.

For first the tzitzis assists in the uprightness of the heart (yashrus ha-lev).

Tzitzis comes first, helping straighten and prepare the heart.

ל"ב חוטים בחי' לב ל"ב נתיבות חכמה שבלב.

The 32 threads [of tzitzis] correspond to "lev" (heart, gematria 32), the 32 pathways of wisdom that are in the heart.

The 32 strings of tzitzis allude to the "32 pathways of wisdom," rooted in the heart (lev = 32).

וכן דרשו חז"ל בגדיך לבנים זה ציצית אח"כ שמן כו' אל יחסר זה תפילין שהוא בחי' קדושה.

And so Chazal expounded: "Let your garments be white" (Koheles 9:8) — this is tzitzis; afterward, "let oil not be lacking" — this is tefillin, which is the aspect of holiness (kedushah).

The "white garments" are tzitzis (the body's elevation), and the "oil" is tefillin (the soul's holiness), following in that order.

וציצית הכנה למען תזכרו כו' אח"כ והייתם קדושים כו'.

And tzitzis is a preparation — "so that you shall remember [all the mitzvos]" — and afterward "and you shall be holy." (Bamidbar 15:40)

Tzitzis prepares one through remembrance, leading to the subsequent state of holiness.

וצריך האדם בכל יום לקיים אלה המצות לתקן ולזכך הגוף להיות כלי לקבל קדושת הנשמה המאירה לבנ"י בכל יום מהשמים.

And a person must fulfill these mitzvos each day, to rectify and purify the body so that it becomes a vessel (keli) to receive the holiness of the soul, which shines to Bnei Yisrael each day from Heaven.

Daily performance of these mitzvos refines the body into a fit vessel for the soul's holiness that descends fresh each day.

ונראה שנותן עתה מצות ציצית שקודם החטאים שהיו דבקים בבחי' מרע"ה כולם קדושים לא היו צריכין לתיקון הגוף רק אח"כ שנתרחקו ממדריגת משה רבינו ע"ה.

And it appears that He gives the mitzvah of tzitzis now [after the sins], for before the sins, when they were cleaving to the aspect of Moshe Rabbeinu — "all of them holy" — they did not need rectification of the body; only afterward, when they distanced themselves from the level of Moshe Rabbeinu.

Tzitzis was given only after the people had fallen from their attachment to Moshe; while still on his level, "all holy," their bodies needed no such rectification.

ולכן איתא שקרח חלק על מצות ציצית בחשבו שכולם קדושים כו'.

Therefore it is taught that Korach disputed the mitzvah of tzitzis, thinking that "all of them are holy."

Korach challenged tzitzis precisely by claiming the entire nation was already holy and needed no such garment.

והוא לא ידע כי נפלו אח"כ ממדריגה ראשונה שהי' להם בהר סיני.

But he did not know that they had fallen afterward from the original level they had had at Har Sinai.

Korach failed to realize the people had already descended from their lofty Sinai-level and now did need tzitzis.

וגם ציצית הוא בחי' החסד אהרן הכהן שהיו כל בנ"י סמוכין עליו אחר החטא.

And also tzitzis is the aspect of chesed, Aharon HaKohen, upon whom all of Bnei Yisrael relied after the sin.

Tzitzis also embodies the attribute of chesed represented by Aharon, who supported the nation after they sinned.

וקרח חלק עליו שא"צ לחסד ונאמר עליו בוטח בעשרו יפול כו' וכמ"ש במ"א מזה:

And Korach disputed him, [claiming] that there is no need for chesed; and about him it is said, "One who trusts in his wealth will fall" (Mishlei 11:28), and as written elsewhere about this.

Korach rejected the need for Aharon's chesed, relying instead on his own wealth and merit — of which it is said that such a person will fall.

Summary: Hashem "sowed" mitzvos into all of creation, awakening within Bnei Yisrael two daily renewals — of the outer world and its inner Torah-vitality — corresponding to the rectification of body and soul. Tzitzis (the tallis wrapping the whole body, its 32 threads hinting at the heart's pathways of wisdom) elevates and prepares the body as a vessel, while tefillin embodies the soul's holiness and joy. Tzitzis was given only after Bnei Yisrael fell from their Sinai-level of "all holy"; Korach erred precisely by claiming they were still wholly holy and needed neither tzitzis nor Aharon's chesed — relying on his own wealth, of which it is said, "one who trusts in his wealth will fall."