What Does a Soul Do in Heaven?

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I guess this could be reworded, what is the main purpose of a soul? Even if there are souls what main function do they serve? Do they accompany us through life, gaining knowledge(for whom?), influencing mortal decisions(if so, why?), develop from something(soul seed?) starting at birth? Whatever the soul is or whatever it takes from this worldly existence it may eventually end up in Heaven I assume. Once there does it still have a duty to perform? I see no real purpose for a soul other than to praise God. Why bother with all the Earthly stuff?