Torah, Deuteronomy 24:5: When a man takes a new wife, he shall not go out in the army, nor shall he be subjected to anything associated with it. He shall remain free for his home for one year and delight his wife, whom he has taken.
Usually after the wedding, a man did not have to bother with work too much because in the first year of family life, everybody helps him. And a year later, everything was as usual: family, children, and hard work.
In a person’s spiritual work, this means a cycle during which you perform a right action of correction with a particular desire (wife) and it is considered a year. During the year of working with the desire, you completely treat with your intention everything that is associated with it.
Year (Shana), from the word Leshanot (to repeat, to change), is when you reach the starting point. It means that each year is a new degree.
From KabTV’s “Secrets of the Eternal Book” 10/26/16