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Properties of the number 30

Symbolism

Represent the perfect balance in the cosmic organization.
To Cabalistic, this number is associated with the letter "lamed", in form of sickle "to express the maturity of the crop". It corresponds also to the 12th Arcane of the Tarot, the Hanging, which is interpreted generally as the Expiation, the Sacrifice, the Martyrdom.

Bible

Age to which Jesus began his public ministry. (Lk 3,23)
Judas received thirty silver pieces of the great priests and the ancient to deliver Jesus to them. (Mt 27,3)
It is at 30 years old that John Baptist began to preach.
Ezekiel began to prophesy at 30 years old.
David was 30 years old when he began to reign on Israel. (2 S 5,4)
The 30 kings that Joshua overcame.
Samson had 30 companions. (Jg 14,11)
Israelis cried during 30 days the death of Moses. (Dt 34,8)
Age to which Joseph left prison to govern Egypt.
Height of Noah's Ark in cubits. (Gn 6,15)

General

The sacrifice of the Mass is the most insured means to relieve the defuncts, and especially the Thirtys or the Gregorian Masses. This name comes from saint Gregory who has introduced the use. Himself would have been informed by a revelation of the efficiency of these thirty masses. A day, inflamed for souls of the Purgatory, a very burning charity, he deplored that after his death, he could make nothing any more for them: "My friend, tells him Our Lord, I want to grant in your favor a privilege which will be unique: all soul of the Purgatory that will be offered thirty masses in his honor and without interruption, will be immediately delivered, whatever his debt towards me; and more than that, I will not wait until the masses are celebrated, but I will deliver the soul immediately the offering poured for him." It is not necessary that these thirty masses, tell without interruption, is done by the same priest, neither on the same altar.
Saint John Climaque, monk of the Sinai in the 7th century, has described the thirty degrees of the Christian perfection and the union with God.
According to the revelations received by Mary Agreda, the Virgin Mary arrived at the the perfect age of 30 years old, ceased aging.
Age of Paul during his conversion, marking also the beginning of his apostolic activity.
Jesus was 30 years old when died his adoptive father Joseph, according to visions of Ann-Catherine Emmerick. And according to visions of Maria Valtorta, Joseph was 30 years old when he took as marries the Virgin Mary then 12 years old.
In the appearances of the Virgin Mary in Lourdes, in 1858, Mary appoints herself in thirty letters, "Che soy era immaculada counceptiou" that, under all reserve, could be translated: "It is in Me that you can conceive the splendor and the perfection of the creation before the sin".
In revelations of brother Joseph-Francis, the Virgin Mary asks to the priests of his locality to devote himself to her Immaculate Heart, "but instead of that, they mock gravely of Me. Thousands of titles have been given to Me since 250 years; do they know as little as 30?".
The Koran, with these 114 chapters, is divided into 30 parts. During the month of the Ramadan, the daily reading of these 30 parts is obligatory: a part per day.
The 30 transcendent virtues that a buddha has.
The ancestors of Romulus had raised 30 towers in central Italy.
In India, there are 30 Raghinis, or nymphs of the music.
Among Spartans, there were 30 tribes, 30 senators to the advice of the Ancient and 30 "phyles" by tribe. The Spartans had also divided their territory into 30000 plots, of which two thirds were the property of the citizens, and a third that of the cities like communal goods.
The 30 curias that there was in Rome.
Number being used for measurement of time. A lot of ancient peoples used a month of 30 days, as in the Egyptian month which gave on the whole 360 days per year, plus 5 days for a total of 365 days in the year. Also at Indians, the day of 24 hours has 30 "Mouhourtas", each "Mouhourta" being formed of 30 "Kalas" and each "Kala" of 30 "Cachtas".
The ancient Persia dedicated their month to 30 spirits.
Saint Epiphane tells that it was of tradition to believe that Lazarus was 30 years old when he was resuscitated and that he lived again 30 years after.
In the "Prologue of Zarathroustra", it is written that: "When Zarathroustra was thirty years old, he left his country and the lake of his country, and went in the mountain. There, he profited of his spirit and his solitude and did not weary himself during ten years."
The 30 dynasties of Pharaohs, divided into three Empires, that Manethon (priest at the time of the first Ptolemy) elaborated.
The famous esoteric tale of the Persian mystical poet Attar tells that 30 birds leave in search of their king, the legendary bird Simorgh, to discover finally that they carried it in them.
Age of the Greek philosopher Plato when Socrates died.
The distance from the Earth to the Moon is 30 times the terrestrial diameter.
Anniversary of marriage: weddings of pearl.

Occurrence

The number 30 is used 87 times in the Bible.
The number 30 is used twice in the Koran. (Koran VII,137 and XLVI,14)
The word empire is used 30 times in the Bible - 27 times in the OT and 3 times in the NT.