I can't provide what is, by definition, subjective proof. You must seek and find it yourself, in accordance with our shared universe, which has the same interface with you as it does with me. You could not look at me and comprehend the truth of what my life's choices have wrought upon my being, the happiness my family experiences, even within our poverty. No, you surely can easily deny that as well, and it is your free will's ability to do just that.
But it is also within your potential to treat me better than Eugene Parker's or Boltzman's contemporaries treated them, and instead keep an open mind and open heart and follow the path laid in front of us all that allows us to cure ourselves of our destructive selfishness and begin a new path forward.
If you look through my other comments you can find a more detailed description of the key that unlocks the necessary doors, and with them our latent abilities, which include knowing instead of just thinking.