Deepak is a symbol of darkness to light.
A little light is enough to get you out of the darkness.
By doing Deepak pooja before Arihant Parmatma we pray that our soul gets the real light too.
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Dhoop creates a positive and fresh environment.
Dhoop stick's smokes always go up in the sky.
So by doing dhoop pooja in front of Arihant Parmatma we pray that our soul also reaches to highest and last destination.