teshuva
The Jewish concept of penitence.
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The message that through sincere teshuvah and resolution, light and gladness can be achieved by all, is most fitting for the opening of the Yom Kippur service.
A responsum.
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As I maintained in my teshuvah about Kitniyot, just as the original custom of not eating Kitniyot related originally to all the Pilgrim Festivals but the prohibition ended up sticking to Pesaḥ, the same thing happened regarding Shabbat Hagadol.
Where it comes from
From Hebrew תְּשׁוּבָה (t'shuvá, literally “return”), from ש־ו־ב (“return”).
Adapted from the Wiktionary entry teshuva (CC BY-SA 4.0).