Teshuvah as new creation through bittul

פותח שער לדופקי בתשובה.

"He opens a gate for those who knock in teshuvah."

Citing the liturgical phrase, the Sefas Emes notes that Hashem opens a gate specifically for those who "knock" — who strive to return.

כי עיקר התשובה להמשיך חיות מחדש שעי"ז יכול לתקן כל הקלקולים שנעשה ברי' חדשה.

For the essence of teshuvah is to draw down fresh life-force anew, through which one can repair all the damage, becoming a new creation.

True teshuvah is not patching the old self but drawing down entirely new vitality (chiyus), so that a person is reborn and all his past corruptions are healed.

ולכן צריך להיות מקודם בטל לגמרי.

Therefore one must first become completely nullified (bittul).

To receive this new vitality, a person must first empty himself entirely — total bittul.

כדמיון תהו ובהו חושך.

Like the likeness of "tohu and vohu and darkness" (Bereishis 1:2).

This emptying mirrors the formless void and darkness that preceded creation.

אחר כך ויאמר אלקים יהי אור.

Afterward, "And God said: Let there be light" (Bereishis 1:3).

Just as light emerged only after the primordial void, new spiritual light comes to the penitent only after he has nullified himself.

כן בע"ת צריך לידע שאין לו מציאות וקיום רק מה שהשי"ת יתן לו.

So too the baal teshuvah (penitent) must know that he has no existence or permanence other than what Hashem gives him.

The returning person must recognize that he possesses no independent being at all; whatever existence he has is entirely a gift from Hashem.

ואותיות תשובה הוא תהו ובהו וש' מרומז על חושך.

And the letters of "teshuvah" spell tohu and vohu, and the letter shin alludes to "darkness" (choshech).

The Sefas Emes reads the very word teshuvah as containing tohu, vohu, and (through the shin) darkness — the three elements of the pre-creation void, signaling that teshuvah recreates a person from nothing.

ואח"כ נפתח לו השער הפונה קדים שנאמר עליו יהי' סגור.

And afterward there is opened for him the gate that faces east, of which it is said, "it shall remain shut" (Yechezkel 44:1-2).

After this self-nullification, the normally sealed eastern gate — which Yechezkel says stays closed — is opened for the penitent.

ודופקי בתשובה מכלל שהוא סגור.

And "those who knock in teshuvah" implies that it is shut.

The very language of "knocking" indicates the gate is ordinarily closed — one knocks on a closed door — yet Hashem opens it for the one who returns.

ולכן בשבת קודש נקל לשוב בתשובה דביום השבת יפתח:

Therefore on the holy Shabbos it is easier to return in teshuvah, for "on the day of Shabbos it shall be opened" (Yechezkel 46:1).

Since the prophet states that this gate opens specifically on Shabbos, the holy day carries a special ease for teshuvah — the otherwise sealed gate of return stands open.

Summary: The essence of teshuvah is to draw down wholly new life-force and become a new creation — which first requires total bittul, mirroring the tohu, vohu, and darkness before creation that gave way to "Let there be light." The very letters of teshuvah encode that void. Only after such self-nullification does the sealed eastern gate open for the penitent — and because Yechezkel teaches that this gate opens on Shabbos, the holy day makes teshuvah especially attainable.