Question: Why is there a need for atonement on Yom Kippur if we have already repented?

Rabbeinu Yonah, in his Shaarei Teshuva, poses a profound question: If a person has already repented before Yom Kippur—he has regretted his sins, confessed them, and asked for forgiveness—why then does Yom Kippur come and require further atonement? After all, the verse says, “Shuvu eilai ve’Ashuva aleichem” (Malachi 3:7), meaning that when a person returns to Hashem, Hashem forgives them immediately. So why do we need the extra step of Yom Kippur?

Answer: The unique level of atonement on Yom Kippur
The answer lies in the distinction between mechila (forgiveness) and kappara (atonement). Chazal explain that while mechila refers to the immediate forgiveness a person receives when they sincerely repent, kappara is a deeper cleansing. It is a spiritual purification that removes not just the sin itself, but the lingering effects it has left on the soul.

The Rambam (Hilchot Teshuva 2:7) emphasizes that the uniqueness of Yom Kippur is in its role as a day of kappara. Yom Kippur is not only about being forgiven; it is a day in which Hashem grants kappara, complete purification. As the verse says, “מִכּל חַטֹּאתֵיכֶם לִפְנֵי ה' תִּטְהָרוּ” (Vayikra 16:30) — "from all your sins, before Hashem, you shall be purified." In other words, while repentance before Yom Kippur indeed grants forgiveness, the full atonement—the cleansing of any residual spiritual impact from sin—can only occur on Yom Kippur.

May we all merit to receive a complete kappara on Yom Kippur, to be purified from all sin, and to draw closer to Hashem through sincere and heartfelt teshuva. G’mar Chatima Tova!