How to know?

[Hyraxylos]

I don't think anyone I've met has learned or claimed to have learned more about their past lives than I have, which remains one of my biggest "doubt"-spots in my belief system regardless of how many times I answer that question over and over by explaining how I "cheated".
With most people I think it's a case of "memory leakage" from the spirit to the current brain, which isn't a "normal" occurrence and, to my knowledge, can't be INDUCED very easily.
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The statement below this one is false.
The statement above this one is true.
This statement is false.

[Ravenheart]

I have dreams of being my other self, minus some details. But i don't think they are actual memories, or if they are then this is all very confusing...
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â–  Inquisitor Lavellan â– 

~You're like Rembrandt with a grenade.

[Jasriella]

Well I don't think it was ever meant for us to be able to remember anything of out past lives, so of course it's going to be confusing. In my opinion dreams are possibly the only viable way to dwell into past lives as your body slips into unconsciousness and and the mind practically shuts down, allowing that barrier between spirit and body to meld.
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I am trapped between heaven and hell. My wings carry me upon the winds. Above lies heaven, below hell. Yet I must land in hell to soar in heaven. I am a Dragon!

[Shiari]

However, in dreams, the subconscious rules and it is fond of symbolism and giving the conscious mind what it desires, rather than what actually is.

Otherwise, the shinoar were a part of the federation and I personally was an ensign on the starship Voyager. Somehow, I sincerely doubt those dreams are actually related to a past life.