The Torah, Book of Leviticus, “Acharei Mot” 16:29-31: And it shall be a statute for ever unto you: in the seventh month, on the tenth day of the month, ye shall afflict your souls, and shall do no manner of work, the home born, or the stranger that sojourneth among you. For on this day shall atonement be made for you, to cleanse you; from all your sins shall ye be clean before the Lord. It is a Sabbath of solemn rest unto you, and ye shall afflict your souls; it is a statute forever.
This refers to the Day of Atonement (Yom Kippur), an important event that occurs once a year. The word “year” (Shana) means a cycle.
Together with that, a man receives full correction of the desires on the present level. This means that in this cycle he completes all his accounts, which are that which he was able to correct. That which he was unable to correct, he sends far from him since he doesn’t want to use them.
This means that presently he is pure and constitutes in himself a certain spiritual structure. Therefore, in our world, people symbolically wear only white clothing.
It will happen again because we must repeat this cycle many times until Gmar Tikkun (the end of correction).
From KabTV’s “Secrets of the Eternal Book” 3/6/14