It's very inspiring and shows how vital the pre-Sukkot prep and the first day of Sukkot are for the final step of the teshuvah process in which the Jewish People have been involved until now.
If you haven't done teshuvah yet or if you would like to give your teshuvah one final shlug, the first day of Sukkot is vital for doing so.
As the Kli Yakar says:
"....the first day of the [Sukkot] holiday is the first for the accounting of transgressions. Therefore, the establishment of mass teshuvah needs to be done on that very day."
For the link, please click here.
(It's accompanied by lots of photos for easier reading.)