Ten days after Rosh HaShanah comes Yom Kippur.
During Rosh HaShanah a person awakens, wants to become like the Creator to acquire the quality of bestowal. Aspiring for equivalence with the Creator, one feels oneself more and more, and on the tenth day comes to the state where one sees that he or she is an absolute egoist, completely opposite to the Creator.
Yom Kippur or Judgement Day is the revelation of our evil nature, the day when a person judges oneself.
A person begins to correctly perceive oneself as an egoist, under the rule of the forces acting on him, and is unable to cope with them. In principle, this is not even one’s fault but a given. This is why one should position oneself in this way.
No one, of course, judges him, including the Creator, who arranged all this for him. This is a person’s awareness of one’s spiritual state.
From KabTV’s “Fundamentals of Kabbalah,” 1/29/19