What can I know with 100% certainty? It is possible that Hinduism is true. No, I am not a Hindu but there are Hindus on Earth. It is impossible to test the hypothesis that living things are souls who reincarnate according to karma in an illusory universe called Maya.
I am an agnostic atheist pragmatist. When I am driving, I don't go around thinking that hitting pedestrians won't matter because the pedestrians are not actually real. They are real enough to have consequences for them and for me.
We don't know and probably can't know whether living things are real souls without real bodies, real souls in real bodies or real bodies without real souls.
We also don't know and probably can't know whether the universe is actually real or is a simulation or hallucination or dream or illusion. The most likely scenario is that we will all die without knowing the true nature of selves and universes.
I cry about the fact that there is so much suffering, inequality, injustice, and death in the world. If I could, I would make all living things forever happy - including the dead ones and the never-born ones. I wish I could make all living things all-loving, all-knowing and all-powerful then there would be no suffering, inequality, injustice and death.
Dear living things,
My aim in life is to save and improve all lives. I am requesting all living things to share my goal. One for all and all for one. Together, we can do much more than we can alone.
With unconditional love,
Someone who loves you.