Belief in Kaparah

38. Once a person does teshuvah properly, he must believe fully on Motzei Yom Kippur that he was zocheh to a complete kaparah and is like a newborn child. Some hold that if one does not believe this, his teshuvah indeed is not accepted. Thus, one should not, ח"ו , despair due to the great quantity of his aveiros. Instead, he should do Teshuvah and have tremendous joy in his heart that he was zocheh to a gift from Hashem in the form of kaparah for aveiros.

''השיבנו ה' אליך ונשובה חדש ימינו כקדם'' (איכה)