Musar su Levitico 25:8

The creation of the physical world in the 7 days of Creation is described as הבל הבלים הכל הבל. This is why man is not to live in that world exclusively but should endeavor to cleave to a world based on a different kind of הבל i.e. the seven days of creation in the sin-free higher world. There man is to commune with G–d in solitude. These days are referred to as the seven days of בנין. They are to be viewed as seven times seven days, corresponding to the forty-nine שערי בינה. Each of these days comprises seven sections as explained at length in the Pardes Rimonim. When one adds what is known in the circles specializing in גימטריאות as the כולל, the word itself, in this case the emanation בינה, one arrives at the number fifty, the highest of the "gates of insight" attainable by man. Above the regions we have described as בנין, we come to a region inaccessible to man where G–d operates with the 42-lettered name, i.e. another domain in which seven units of six each are active. Our Kabbalists have found an allusion to this domain in the verse שלח תשלח את האם, (Deut. 22,7) a reference to the "Mother Superior” in the Celestial Regions. There is no way we humans can access this domain while bound by a body, and this is why the verse in Deuteronomy alludes to this by saying רק הבנים תקח לך, "you may only take the young ones for yourself," i.e. only lower emanations and domains represented by them are accessible to humans. These seven times seven periods alluded to the six times one thousand years this world is to exist and the one thousand years it is to be in a state of destruction before giving way to a more perfect universe. When a cycle of this kind has repeated itself seven times the ultimate perfect world will emerge. All of this is alluded to in the concept of these seven times six words representing the 42-lettered name of G–d. The six letters (words) in each section of these names correspond to the six days of active Creation. When the word itself is added it alludes to the Sabbath, the seventh day. [You will observe that the prayer אנא בכח which we mentioned as being recited before לכה דודי is also recited daily in the mornings during the recital of the order of daily sacrifices. At the end of each line the first letters of each of the six words in the stanza are printed as an acronym to reflect what the author has just tried to explain. Ed.] As a result you will arrive at the division of this name into seven times seven. The Torah alludes to all this when it instructs us in Leviticus 25,8: "Count for yourself seven times seven Sabbaths of years; these seven times seven Sabbaths of years shall total forty- nine years." These "years" are "days" in G–d's calendar [where a day equals one year. Ed.] This whole verse is an allusion to the name of G–d as described in the אנא בכח prayer. This is the deeper meaning of the "cripple" in our parable having seven palaces and why on each palace the verse of Kohelet referring to the seven הבלים was inscribed. They are to be understood as seven להבים, fiery emissions from the mouth of G–dץ Since we have a principle that G–d provided alternatives for everything He created, there must also be alternatives for the manner in which ascent to holiness is possible.

The words שבת שבתות are a further allusion to the seven days of Creation during which a new world was created. The fiftieth year corresponds to the seventieth year of one's life.