Toil in Torah elevates the physical

במד' חשבתי דרכי כו'.

In the Midrash: "I considered my ways [and turned my feet to Your testimonies]" (Tehillim 119:59).

The Sefas Emes opens with Dovid HaMelech's words about reflecting on his ways and directing his steps toward Hashem's mitzvos.

רגלי היא דרגא תחתונה שבאדם ומחשבה בראש האדם.

The "feet" (raglai) are the lowest level in a person, while thought (machshavah) is in the head of a person.

He reads the verse as a map of the human being: the feet represent his lowest, most physical dimension; the mind represents his highest.

וסוף מעשה במחשבה תחלה.

"The end of the deed is first in thought."

Quoting the well-known phrase from Lecha Dodi/Chazal, the final action is already contained in the original thought that conceived it.

וע"י שמביאין כח המחשבה תוך המעשים להיות כל מעשה בישוב הדעת עי"ז מתרומם הגשמיות ומדרגה התחתונה שבאדם.

By bringing the power of thought into one's deeds, so that every act is done with yishuv hada'as (a settled, deliberate mind), through this the physicality and the lowest level within a person are elevated.

When a person infuses his physical actions with conscious thought and intention, he lifts up his "feet" — his bodily, mundane self — to the level of his "head."

וזהו אם בחקותי תלכו שהיא בחי' הביטול אל השורש כי לכל דבר יש שורש בשמים.

This is the meaning of "If you walk in My chukim": it is the aspect of bittul (nullification) to the root, for everything has a root in Shomayim.

"Walking in the chukim" means binding one's actions back to their heavenly source — every thing in this world has a spiritual root above to which it can be reconnected.

בפרט לנפש האדם.

This is especially true of the soul of a person.

Above all created things, the human neshamah has a lofty root in Shomayim.

ובנ"י ע"י התורה הם מתדבקין בהקב"ה שיש לכל איש ישראל חלק בתורה.

And Bnei Yisrael, through the Torah, cleave to Hashem, for every Jew has a portion (cheilek) in the Torah.

Torah is the bond of deveikus: since each Yid possesses his own unique share in the Torah, learning it connects him directly to Hashem.

וע"ז מבקשין ותן חלקנו בתורתך וע"י היגיעה בתורה יכול להתברר לאדם חלקו.

For this we ask, "Grant us our portion in Your Torah," and through the toil (yegiah) of Torah a person can have his portion clarified for him.

The tefillah for "our portion in Your Torah" is fulfilled through diligent labor in learning, by which a person uncovers the specific part of Torah that is rooted in his own soul.

כי כל הדברים חקוקים בתורה.

For all things are engraved (chakukim) within the Torah.

Playing on chukim/chakukim (engraved), every created reality is "etched" into the Torah, which is the blueprint of all existence.

וכן נפשות בנ"י יש לכ"א חקיקה בתורה.

So too the souls of Bnei Yisrael — each one has an engraving (chakikah) within the Torah.

Just as everything is inscribed in Torah, so is every Jewish neshamah, each with its own letter or portion engraved there.

וז"ש בחקותי תלכו ודרשו חז"ל להיות עמלים בתורה.

This is the meaning of "If you walk in My chukim," which Chazal expounded to mean "that you toil in the Torah."

Rashi/the Sifra read "in My chukim" as a call to amal — strenuous toil in Torah — which is precisely how one uncovers his engraved portion.

ועי"ז יכולין להתדבק בשורש הנשמה למעלה מהטבע.

Through this one can cleave to the root of the soul, which is above nature.

The toil of Torah reconnects a person to the supernal root of his neshamah, lifting him beyond the bounds of the natural world.

ומזה בא מ"ש כל ישראל יש להם חלק לעוה"ב.

From this comes the statement, "All Yisrael have a portion in the World to Come."

Because each Jew's soul is rooted above nature through his portion in Torah, every Yid has an enduring share in Olam Haba.

ונתתי גשמיכם בעתם היא התדבקות הגשמיות בשורש כמ"ש לכל זמן ועת כו':

"And I will give your rains in their season" is the cleaving of physicality to its root, as it is written, "Everything has its season, and a time [for every matter]" (Koheles 3:1).

The blessing of timely rains symbolizes the goal of the whole avodah: even gashmiyus (material life) becomes attached to its spiritual source, each thing flowing in its proper time.

Summary: "Walking in Hashem's chukim" means elevating one's lowest, physical self by infusing every act with conscious, settled thought, binding it back to its root in Shomayim. Through the toil (amal) of Torah — in which every soul and every thing is "engraved" — a Jew uncovers his unique portion, cleaves to the supernal root of his neshamah above nature, and thereby even his physical life is reconnected to its Source.