A day over which the Satan has no control
You know that in a year there are 365 days, and "HaSatan" (the Satan) has a numerical value (gematria) of 364. He has one day over which he has no control. Which day? Yom Kippur, he has no control over it.

A day over which the Satan has no control.
You know that in a year there are 365 days, and "HaSatan" (the Satan) has a numerical value (gematria) of 364.
He has one day over which he has no control. Which day? Yom Kippur, he has no control over it.
And therefore, he does not prosecute; there are no accusations—on the contrary. He turns into a defense attorney, as it is written in the Zohar.
These days of the Ten Days of Repentance, the Pele Yoetz writes: they are days so important, like the difference between light and darkness compared to ordinary days. If you place ordinary days on one side and place the Ten Days of Repentance on the other, here you see a tremendous light, and here you see darkness. That is how important these days are; they possess a very special spiritual power unlike any other.