Always remain a seeker at Hashem's door

והוא יושב פתח כו' כבר דברנו בזה השבח שנאמר לאאע"ה אחר שזכה לכל המדריגה הגדולה הוא יושב בפתח וע"ז נאמר אשרי שומע לי לשקוד על דלתותי יום יום כו'

"And he was sitting at the entrance…" — we have already spoken of this praise stated about Avraham Avinu: after he had attained the entire lofty level, "he was sitting at the entrance"; and concerning this it is said, "Fortunate is the one who listens to Me, to watch at My doors day by day…"

Even after reaching the heights of closeness to Hashem, Avraham still "sat at the entrance" — humbly waiting, as one who keeps watch daily at Hashem's doorway, never assuming he has arrived.

בלי ספק מי ששומע אליו יתברך בכל יום הוא זוכה למדריגות רבות ונפלאות כמ"ש אשרי.

Without doubt, one who listens to Him every day merits many wondrous levels, as it says "Fortunate [is the one who listens to Me]."

Daily, attentive listening to Hashem's will lifts a person to ever-greater spiritual heights.

אעפ"כ יהי' שוקד על דלתותי.

Nevertheless, he should still keep watch at My doors.

No matter how high one rises, one must remain like a watchman stationed at the door — always yearning to draw closer, never resting on what was already achieved.

זה שנאמר והוא יושב פתח האהל כחום היום פי' אחר כל התלהבות הגדול שהי' לו במראה הזאת.

This is the meaning of "and he was sitting at the entrance of the tent in the heat of the day" — that is, even after all the great hislahavus (fervor) he had in this revelation [of the Shechinah],

"The heat of the day" hints at the burning closeness of the Divine revelation Avraham had just experienced.

אעפ"כ ישב בפתח:

nevertheless he sat at the entrance.

Even at the peak of that fiery encounter with the Shechinah, Avraham positioned himself humbly at the "entrance" — still a seeker watching at the doorway, embodying the perpetual avodah of striving onward.

Summary: Even after attaining the loftiest madreigos and experiencing the heat of Divine revelation, Avraham "sat at the entrance" — like the one praised in Mishlei who watches daily at Hashem's doors. The Sefas Emes teaches that true greatness never rests on what it has achieved; one must always remain a humble watchman at the doorway, perpetually striving to draw nearer to Hashem.