Thread by @poonamdut

What is the logic behind reciting a 'mantra' 108 times, or say 500 times, in Hindu Scriptures?

Mantra recitation is not part of Hindu “scriptures” it is part of Hindu Spiritual practice.
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Mantras are all recited 108 times or multiples thereof. But when keeping count only multiples of 100 are recorded.

The reason is 100 are recited for yourself and 8 for the benefit of all other beings. So the 8 and multiples thereof are not counted.
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0 = shunya - total of all possibilities, 1 = jiva, and 8 = death. 1+0+8 = 9 which is a recurring number = samsara.

Why 8 for others? Does the 100 and 8 have particular significance or just random?
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Why only 8? Well you need to work on yourself before you can help others - 8 is better than nothing.
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Another reason: 108 is approx the ratio of sun’s diameter to earth’s & earth’s to moon. Also, ratio of distance between sun & earth to that between earth & moon is approx 108. Scientific data as measured by today’s measurement devices seems to suggest it is close to 108 +- 5.

And here's a video that throws further light on mantra chanting, speaks of a different aspect.
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