All proofs require first principles. A proof starts with givens, postulates, and derives a conclusion from them. Regardless of how sound the proof, the conclusion could never be more solid than those givens. In other words, if I want someone to accept my rigorous proof of G-d’s existance, they must first accept all my givens, as well as the validity of each of my implications. Making a proof more rigorous will involve spelling out more givens and more deductive steps. Ironically, getting someone to accept the more rigorous proof requires that the person start out agreeing with more of your perspective, not less.We could ask someone to experience Z and therefore believe Z. Or, to agree that he has grounds from experience to accept X and Y — and don’t X and Y combined imply Z? But if he doesn’t accept X as a given? Well, we can prove X from T and U, and Y from V and W. There is an infinite regress possible, continually trying to prove our first princples. Getting to ever more self-evident statements.Perhaps this is why in practice we are more moved by the experience