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For reasons so far unknown, Hindus and Jains have used various yantras which are no more than numbers 1 to 9 arranged in such a way that the sums of numbers in horizontal, vertical or diagonal squares add up to 15.
The table below is one example.
8 1 6 3 5 7 4 92
This is a simple combination. Here, there is no great mathematical trick. As stated above, the sum total of all numbers given in any horizontal, vertical or diagonal lines is 15. How and why this simple table is regarded, as a yantra, which can be used for worship, is a mystery.
In a book called the 'Anka-yantra-sär', it is said that this yantra popularly known as the 'yantra of fifteen' is the yantra for achieving victory over death. (Mrityunjayayantra)
The complete system of how to write this yantra has been explained in Sanskrit verses. It says: The Goddess Pärvati, asked her husband Lord Shiva to describe the auspicious yantra. Lord Shiva, unable to refuse, explains the way and method of creating the yantra.
He says. "Place nos. 1 to 9 in the following order. Write Nol in the second square, No 2 in the ninth, No.3 in the fourth, No 4 in the seventh, No 5 in the fifth, No 6 in the third, No 7 in the sixth and No. 8 in the first and finally No 9 in the eighth square.
This yantra brings peace, is capable of getting someone to your side, it restrains anyone who is inclined to harm you or who is jealous of you. It can even uproot or kill bad omens.
Choose an auspicious day, observe some form of fasting and copy the yantra five or ten thousand times, after that the Lord says that once you have drawn a table of blank squares, always write starting from square No 6 or 8, or the fourth one.
This yantra could be written on a leaf of the bhoja tree, be placed in a small medallion and can be worn. It can even be inscribed on a gold ring and worn on your finger. This saves man from an accidental death"
The above description clearly illustrates the importance of even a simple yantra of numbers. The yantra of fifteen can again be written in different ways. Some of them have been shown here.
There are lots of other yantras, which use only numbers. The yantra of twenty would be where the sum total of all horizontal, vertical and diagonal lines would be 20.
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