I don’t think there is proof in the scientific sense. People makes decisions about what they believe based on their own experiences, and background. Years ago I interpreted a certain experience one way but now I can look back and see why i did and realize that today I would interpret a similar experience differently.
Perhaps we can’t know what may be beyond the physical from within the ohysical. Perhaps the experience is a hint at our potential. For whatever reason we go a bit beyond where most of humanity is to a place where evolution may take us. We access more of the brains potential than we normally do. Perhaps that is part of evolution and the sense of well being and peace comes from the insight into the future of mankind rather than the future in an afterlife. If that is the case I am still amazed at the incredible vision of folks like Jesus and Buddha who grasped so much so long ago. I suppose I’ll find out when I get there {or not} One of the coolest things is realizing that whatever the truth may be concerning an afterlife, it doesn’t have to change what we do in the here and now. Trying to live up to our potential as humans and find a unity is something people from any belief can do.
Sometimes the insight comes from focusing on spiritual things but not always. In a personal example it came in a moment of emotional crisis. I went from despair to an incredible sense of peace understanding and well being after a vision of sorts. What still amazes me was the profound insight into human interaction and how personal choices, even the unpleasant ones that lead us to places of utter despair, are a natural part of our growth together as people. The 2nd part of that revelation came later and in a more subtle way. To quote Don Henly, I think the heart of the matter is forgiveness. We don’t have to wait to be forgiven by placating an angry or jealous god. We must actively and sincerely forgive ourselves and in seeing our own need for forgiveness, and our connection to others, we extend that forgiveness to others. It requires some and focus. Our culture doesn’t really teach us that. But I digress.
I believe you are correct. The question is do we have that by chance of evolution or is it a part of spiritual growth we cannot comprehend. I tend to believe in reincarnation and in my limited understanding the details of our lives and what our spiritual aptitude is or isn’t directly relates to our growth in a previous life.
I do wonder how what we refer to as lower life forms relates to the big picture spiritually speaking. I’ve seen lots of animals exhibit very human like traits that I wouldn’t expect from a creature running on instinct. I’ve had plenty of experiences such as you describe. Even musically, when doing a song on stage that I’ve done a thousand times and find a bit dull, I can think of other things while still hitting all the notes. The song ends and I barely remember doing it. I do wonder about the different characteristics of animals. Why are cats more independent? Is that higher or lower? This is going to sound cruel {or simply crazy} but could it be that animals have a higher percentage of themselves unconscious? I’ve met humans that seem to have far to much of themselves totally oblivious of higher concepts. In them it seems only the ability to speak separates them from a really good dog or cat.