The Talmud teaches that suffering is one of four things that require a person to cry out to God, and that a person should examine their deeds when afflicted. It also states that suffering cleanses a person of sin, comparing it to a purifying fire.
אָמַר לָהֶן: לְכָךְ אֲנִי מְשַׂחֵק, כׇּל זְמַן שֶׁאֲנִי רוֹאֶה רַבִּי שֶׁאֵין יֵינוֹ מַחְמִיץ וְאֵין פִּשְׁתָּנוֹ לוֹקֶה וְאֵין שַׁמְנוֹ מַבְאִישׁ וְאֵין דּוּבְשָׁנוֹ מַדְבִּישׁ, אָמַרְתִּי שֶׁמָּא חַס וְשָׁלוֹם קִיבֵּל רַבִּי עוֹלָמוֹ. וְעַכְשָׁיו שֶׁאֲנִי רוֹאֶה רַבִּי בְּצַעַר, אֲנִי שָׂמֵחַ. אָמַר לוֹ: עֲקִיבָא, כְּלוּם חִיסַּרְתִּי מִן הַתּוֹרָה כּוּלָּהּ? אָמַר לוֹ: לִימַּדְתָּנוּ רַבֵּינוּ, ״כִּי אָדָם אֵין צַדִּיק בָּאָרֶץ אֲשֶׁר יַעֲשֶׂה טּוֹב וְלֹא יֶחֱטָא״. נַעֲנָה רַבִּי עֲקִיבָא וְאָמַר: חֲבִיבִין יִסּוּרִין. אָמַר לָהֶם: סַמְּכוּנִי וְאֶשְׁמְעָה דִּבְרֵי עֲקִיבָא תַּלְמִידִי שֶׁאָמַר חֲבִיבִין יִסּוּרִין. אָמַר לוֹ: עֲקִיבָא, זוֹ מִנַּיִן לָךְ? אָמַר: מִקְרָא אֲנִי דּוֹרֵשׁ: ״בֶּן שְׁתֵּים עֶשְׂרֵה שָׁנָה מְנַשֶּׁה בְמׇלְכוֹ וַחֲמִשִּׁים וְחָמֵשׁ שָׁנָה מָלַךְ בִּירוּשָׁלִָים [וְגוֹ׳] וַיַּעַשׂ הָרַע בְּעֵינֵי ה׳״, וּכְתִיב:
Rabbi Akiva said to them: It is for that reason that I am laughing. As long as I would see for my teacher that neither does his wine ferment and spoil, nor is his flax stricken, nor does his oil spoil, nor does his honey turn rancid, I would say to myself: Perhaps, Heaven forfend, my teacher has already received his world in reward for the mitzvot that he fulfilled, and will not receive a reward in the World-to-Come. But now that I see my teacher overcome with suffering, I am happy. He is receiving punishment in this world for the few transgressions that he might have committed, ensuring that he will receive a complete reward in the World-to-Come. Rabbi Eliezer said to him: Akiva, have I failed to fulfill any portion of the entire Torah? Rabbi Akiva said to him, you taught us, our teacher: “For there is not a righteous man upon earth who does good and sins not” (Ecclesiastes 7:20). Rabbi Akiva responded and said: Afflictions are cherished. When Rabbi Eliezer heard this he said to his attendants: Support me so I can sit and hear the statement of Akiva my student, who said: Afflictions are cherished. Rabbi Eliezer said to him: Akiva, from where do you derive this? Rabbi Akiva said: I interpret a verse in order to derive it. It is written: “Manasseh was twelve years old when he began to reign and he reigned fifty-five years in Jerusalem…And he performed that which was evil in the eyes of the Lord” (II Kings 21:1–2). And it is written: