What is so important about the number 9. We (Indians) consider that this number has got some mystic power behind it. We have navagrahas ( 9 planets ), navaratnas ( 9 jewels ), navadhanyam ( 9 grains ), navarasam ( 9 feelings ), navapashanam ( 9 stones) , navadhwaram ( 9 holes ). Also we have Goddess Durga's festival navaratri. Navami is an important day and is considered to be auspicious. so why so much about the number 9.
A bramhachari is also asked to chant gayatri mantra in multiples of 9's ( 27, 54, 108 etc....) Not only gayatri mantra, even the panchakshari mantra is also chanted in multiples of 9.
The reason behind is simple yet very powerful which will leave us thinking for a while.
According to Sanatana Dharma, number 8 is considered to be the number of humans and number 9 is considered to be the number of god.
Humans are greedy beings. The more they get the more they want. There's no end to his wants. But as a person keeps moving up in life, achieving greater things, he keeps decreasing his value.
Lets see why our rishis gave humans the number 8 with this example. Lets look into the multiple table of 8.
8 * 1 = 8 = 8 + 0 = 8
8 * 2 = 16 = 1 + 6 = 7
8 * 3 = 24 = 2 + 4 = 6
8 * 4 = 32 = 3 + 2 = 5
8 * 5 = 40 = 4 + 0 = 4
8 * 6 = 48 = 4 + 8 = 12 = 1 + 2 = 3
8 * 7 = 56 = 5 + 6 = 11 = 1 + 1 = 2
8 * 8 = 64 = 6 + 4 = 10 = 1 + 0 = 1
8 * 9 = 72 = 7 + 2 = 9
8 * 10 = 80 = 8 + 0 = 8
If you observe the results carefully, you see that human start with a value 8. But as he is not satisfied with his present life, he tries to multiply himself with higher numbers (things) and feels that he is growing up in life. But he forgets that every time he is multiplying himself with higher values he is actually losing his value. But ultimately when he multiplies himself with the number 9, the number of god, he becomes god.
Now lets look at multiples of 9
9 * 1 = 9 = 9 + 0 = 9
9 * 2 = 18 = 1 + 8 = 9
9 * 3 = 27 = 2 + 7 = 9
9 * 4 = 36 = 3 + 6 = 9
9 * 5 = 45 = 4 + 5 = 9
9 * 6 = 54 = 5 + 4 = 9
9 * 7 = 63 = 6 + 3 = 9
9 * 8 = 72 = 7 + 2 = 9
9 * 9 = 81 = 8 + 1 = 9
9 * 10 = 90 = 9 + 0 = 9
The number 9 no matter what you multiply with never loses its value. Its always constant. This is because our rishis attributed number 9 as the number of god.
No matter how much we grow in life, unless we identify ourselves with god we are always short of the biggest number
