The soul as a limitless portion of the Divine

בפסוק נפש כי תחטא ובמדרש וגם הנפש לא תמנא לפי שהיא מלמעלה משל לעירוני שנטל בת מלכים כו'.

On the pasuk "a soul (nefesh) when it sins," and in the Midrash: "and also the nefesh shall not be filled," because it is from above — a parable of a commoner who married a princess.

The Midrash compares the nefesh, which originates from on high, to a princess wed to a commoner: no earthly thing can ever fully satisfy her, for her source is far higher.

כי הנפש יש בה כמה מדריגות.

For the soul contains several levels (madreigos).

The soul is not a single flat thing; it ascends through a series of ever-higher levels.

כדאיתא זכה נטל נפש. זכה יתיר יהבין לי' רוחא. יהבין לי' נשמתא ע"ש בזוהר אמור.

As it is brought down: if one merits, he receives nefesh; if he merits more, they grant him ruach; they grant him neshamah — see there in the Zohar, parshas Emor.

The Zohar describes an ascending order — nefesh, then ruach, then neshamah — each level attained through greater spiritual merit.

ולעולם אין לזה שיעור שהנשמה חלק אלקות.

And there is never any limit to this, for the neshamah is a portion of the Divine (chelek Elokus).

Because the neshamah is literally a piece of the Divine, the soul's potential ascent has no ceiling.

ולעולם הנפש לא תמלא.

And the nefesh is never filled.

No finite attainment can ever fully satisfy the soul, since it yearns for its infinite Source.

אבל כפי עבודת האדם זוכה להאיר הנפש ולהשלימה.

But according to a person's avodah he merits to illuminate the soul and to make it more complete.

Though it can never be wholly filled, each effort of avodah brings more light into the soul and brings it closer to wholeness.

וע"ז ניתן המצות כמ"ש אשר יעשה אותם האדם וחי בהם להמשיך חיות הנשמה אל הגוף ולהגביר הנפש על הגוף.

And for this the mitzvos were given, as it is written "which a person shall do and live by them" — to draw the vitality of the neshamah into the body and to make the soul dominant over the body.

The mitzvos are the means by which a person channels his neshamah's life into his body and establishes the soul as ruler over physical drives.

וע"י החטא להיפוך שליט הגוף על הנפש.

And through sin the reverse occurs — the body rules over the soul.

Sin inverts the proper order, placing the physical body in command and subjugating the soul.

וזה נפש כי תחטא לשון חסרון.

And this is "a soul when it sins" — a term denoting lack (chisaron).

The phrase "nefesh ki techeta" hints that sin produces a deficiency in the soul, diminishing its light.

שעכ"פ צריך האדם להיות בינוני. זה וזה שופטן.

For at the very least a person must be a beinoni (intermediate), with "both this and that judging him."

One must at minimum keep body and soul in balance — neither wholly dominating — so that the inner struggle remains alive.

ולא שיגבר הגוף על הנפש. שזה מדת הרשעים.

And not that the body should overpower the soul — for that is the trait of resha'im.

Allowing the body to rule completely over the soul is the defining trait of the wicked.

בחייהם קרוין מתים. שאין הנפש שליט לחיות את הגוף.

In their lifetimes they are called dead, for the soul is not in command to give life to the body.

Chazal call resha'im "dead while alive," because their soul no longer rules to infuse true life into the body.

אבל הצדיקים משליטין הנפש על הגוף.

But tzaddikim make the soul rule over the body.

A tzaddik establishes the soul as sovereign, directing the body to serve it.

ואז גם הגוף בכלל החיים.

And then even the body is included in "life."

When the soul rules, its life flows into the body as well, so that even the physical is counted among the living.

ובשבת קודש מאיר הנשמה יתירה.

And on Shabbos Kodesh the neshamah yeseirah (additional soul) shines.

Shabbos brings an added soul-light, intensifying the soul's illumination far beyond the weekday.

וזה היפוך נפש כי תחטא. אדרבא הנפש מתחזק בשלימות:

And this is the opposite of "a soul when it sins" — on the contrary, the soul grows strong in wholeness.

Where sin causes deficiency in the soul, Shabbos accomplishes the reverse: through the neshamah yeseirah the soul is strengthened toward its completeness.

Summary: The soul is a portion of the Divine and therefore can never be fully satisfied; it rises through nefesh, ruach, and neshamah without limit. The mitzvos draw the neshamah's life into the body and make the soul rule over it — life — while sin reverses this, making the body dominant, which is the "death" of the resha'im. On Shabbos the neshamah yeseirah shines, the exact opposite of "nefesh ki techeta," strengthening the soul toward wholeness.