The Avos awaken teshuvah; din yields to chesed

איתא במדרש אברהם תבע זקנה יצחק יסורים יעקב חולי.

It is taught in the Midrash: Avraham requested old age, Yitzchak requested suffering, Yaakov requested illness.

Each of the Avos asked Hashem to introduce a new condition into the world — old age, suffering, and sickness — each according to his own middah.

כי עיקר רצון האבות היה לקרב בני ישראל לאביהם שבשמים ולתשובה.

For the essential desire of the Avos was to bring Bnei Yisrael close to their Father in Heaven and to teshuvah.

Everything the Patriarchs sought was aimed at drawing their descendants nearer to Hashem and awakening them to repentance.

ומדת אאע"ה החסד.

And the middah of Avraham Avinu was chesed (lovingkindness).

Avraham's defining attribute was kindness, and his request flowed from that quality.

וזה בחי' התעוררת מכח הזקנה.

And this is the aspect of awakening through the power of old age.

Old age, Avraham's gift, awakens a person to teshuvah in a gentle, kindly way.

רוב שנים יודיעו חכמה.

"Multitude of years shall make wisdom known."

The accumulated years of old age bring a person to wisdom and reflection.

שמיישב האדם א"ע כמה חסדים עובר עליו תמיד מהקב"ה.

For a person comes to consider how many kindnesses Hashem continually bestows upon him.

Through the perspective of age, one looks back and recognizes the unending chesed Hashem has shown him throughout his life.

ומתעורר לתשובה ע"י הזקנה שרואה שמתקרב אל המיתה לחזור נשמתו.

And he is awakened to teshuvah through old age, when he sees that he is drawing near to death, to return his soul.

Old age stirs teshuvah by making a person aware that his life is approaching its end and his neshamah will return to its Source.

ויצחק במדה"ד תבע יסורים.

And Yitzchak, in the midas hadin (attribute of strict justice), requested suffering.

Yitzchak's attribute was din, so the awakening he introduced was the harsher one of yissurim (suffering).

ויעקב במדת רחמים הממוצע תבע חולי כדכתיב תשב אנוש עד דכא ותאמר שובו בני אדם.

And Yaakov, in the middas rachamim (attribute of mercy) that is the middle balance, requested illness, as it is written: "You return man unto contrition, and say, Return, O children of men."

Yaakov's attribute is mercy, balanced between chesed and din; sickness humbles a person — "unto contrition" — and prompts him to return, "Return, O children of men."

ובקשת אליעזר הי' עשה חסד עם אדוני אברהם.

And the request of Eliezer was: "Do chesed with my master Avraham."

Eliezer, sent to find a wife for Yitzchak, prayed that Hashem act with kindness for Avraham's sake.

במד' התחלת גמור.

In the Midrash: "You began — complete it."

Eliezer pleaded that since Hashem had begun showing chesed to Avraham, He should now bring it to completion.

במו שהבטיח הקב"ה לאברהם אע"ה בך חותמין.

Just as the Holy One, blessed be He, promised Avraham Avinu, "With you they conclude."

Avraham was assured that he would be the one with whom blessings are sealed — both beginning and end belong to chesed.

כי התחלה בחסד וסופו בחסד.

For the beginning is in chesed and its end is in chesed.

The world's order runs from kindness to kindness — chesed frames everything from start to finish.

כמ"ש חז"ל התורה התחילה בגמ"ח וסופה בגמ"ח.

As Chazal said: the Torah begins with gemilus chasadim and ends with gemilus chasadim.

The Torah opens with Hashem clothing Adam and closes with His burial of Moshe — both acts of kindness — framing all of Torah in chesed.

ומצינו דאברהם קיבל עיקר ברכותיו בסופו כמ"ש ואברהם זקן וה' ברך את אברהם בכל.

And we find that Avraham received the essence of his blessings at his end, as it is written: "And Avraham was old… and Hashem blessed Avraham with everything."

Avraham's chief blessing came in his old age, fittingly, since his attribute of chesed reaches its fullness at the conclusion.

וביצחק כתיב ויהי כי זקן יצחק ותכהינה עיניו.

And of Yitzchak it is written: "And it was, when Yitzchak grew old, that his eyes dimmed."

Yitzchak's old age is marked instead by a dimming of his eyes — a diminishing, in contrast to Avraham's fullness.

דאיתא הכשר בכהנים פסול בלוים.

For it is taught: what renders a kohen fit disqualifies a levi.

The Sefas Emes brings the halachic contrast between kohanim and leviim to illustrate the difference between chesed and din.

כהנים נפסלין במומין וכשרים בשנים.

Kohanim are disqualified by physical blemishes but remain fit despite years (age).

A kohen's service is unaffected by old age — chesed only grows more complete with the passing years.

ולוים כשרין במומין ופסולין בשנים.

And leviim are fit despite blemishes but disqualified by years (age).

A levi, by contrast, becomes unfit for service once he ages — din cannot remain at full strength to the end.

כי מדה"ד צריך להתבטל בסופו למדת החסד.

For the midas hadin must, in its end, become nullified before the middah of chesed.

Strict justice cannot stand on its own at the conclusion; it must yield itself in bittul to kindness.

ושלא יהי' בשלימות.

And it should not remain in full strength.

Din is not meant to persist at full force, for the world could not endure on justice alone.

כי א"א לעולם להתקיים בדין.

For the world cannot endure on judgment.

Pure, unmitigated justice would make the world's survival impossible; it requires chesed to soften it.

לכן כי זקן יצחק נטפל מדה שלו אל החסד.

Therefore, "when Yitzchak grew old," his attribute became subordinated to chesed.

In his old age Yitzchak's middah of din attached itself to and was absorbed within chesed.

ותכהינה עיניו.

"And his eyes dimmed."

The dimming of his eyes expresses this very diminishing of his attribute.

פי' מדתו נתקטנה להיות הגמר בחסד כנ"ל:

Meaning, his attribute was diminished so that the conclusion would be in chesed, as above.

Yitzchak's measure of din contracted at the end of his life so that, as with all things, the final word would belong to chesed.

Summary: The Avos each requested a means of awakening Bnei Yisrael to teshuvah according to his own middah — Avraham (chesed) old age, Yitzchak (din) suffering, Yaakov (rachamim) illness. The deeper theme is that the world runs from chesed to chesed: the Torah begins and ends in kindness, Avraham's chesed reaches fullness in his old age, while Yitzchak's din must diminish ("his eyes dimmed") and subordinate itself to chesed at the end — for the world cannot endure on strict justice alone.