I'm coming in at a random time here, but this is basically the whole "prove that you exist" challenge that your philosophy professor will assign to you.
It's impossible to prove certainly that anything other than possibly your own existence is true. This is because there are so many crazy things which are technically possible.
But we dismiss these things and we live in the world that we observe by the laws and assumptions that have function. When we try to ask questions that are quite possibly impossible to answer, like where does existence/reality/the universe come from, it only makes sense to approach it on the basis of the practical laws a assumptions that we make in ever other thing we do in every day life and to use that as a foundation.
Either that or you can choose to be immobile and wait to starve to death.
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