1. Experiencing universal awareness. This can be done through meditation or psychedelics, people report this themselves as knowing the universe is made out of universal consciousness. Does that mean we will have the experience of the same knowing when we experience it? There's only one way to find out. 2. Psychedelic induced (shared) trips Our brain already hallucinates most of our vision into being. We know that our minds can hallucinate things into being as well, often a projection of (strong) fear or belief. It's often said that psychedelics will only make us hallucinate. However this does not seem to be the case. While definitively one can experience distortions that seem to come from our personal mind, some hallucinations of other beings, dimensions or state of being can feel extremely real, sometimes realer than this reality even. And sometimes people experience these hallucinations together. Either through a vision of the same thing, at the same time at the same spot. Or because people can experience meeting each other in completely mental realms, while having lost consciousness of the body, to later confirm it while consciousness of the body is regained.
A breakthrough experience of any psychedelic it self will often turn the most staunch atheist into adopting a more spiritual or agnostic world view. The video below shows what a breakthrough dose of the molecule N,N-DMT can do to you. It is one of the most potent psychedelics, the molecule is made in our own bodies, and in a host of other plants and animals. Be aware though, a break through experiences can be very very very intense, one needs to be mentally stable to be able to undergo these things and integrate them properly. The epitome of a mentally stable person probable would something like an elderly Buddhist monk and the opposite of that would be an anxious traumatized mind with no wisdom and or very little awareness about it self, and this actually goes for most adults in our society. Which by the way is the true cause of mental illness, a broken ego caused by trauma.
3. Shared dreams Our dreams are tricky, a part of our dreams are clearly a recollection of things we experienced during the day, however those who can remember their dreams (by the way, you can train this) experience dreams which seem to not be related to any events experienced by us during the day, that these dreams can sometimes feel much more real and can have beings or people in them that seem to have their own completely unique and complex personality. A way to find out if these experience are real (aside from your own personal experience), is to have them with someone you know, simply by remembering your dreams and sharing them with each other. People often tend to find out about this by accident, twins and siblings for example tend to know about this more often.
4. Psychic mediums In my research I have found there to be two kinds of mediums; the ones that keep throwing out general unspecific guesses to gauge for reactions and the ones who are being able to consistently bring through specific and intimate information they should not be able to know. Mediums can be a great tool to obtain proof for the soul, it should be easy to determine whether a medium is legit or not and you tell the medium you beforehand that you will only pay if they were able to prove themselves to you. Here are a few nice examples of mediums who are able to bring such information through cosistently:
5. Synchronicity This will be the most interpretive form evidence, but people (on the spiritual path) claim that life can show it self to be led by a higher intelligence because they see how extraordinary 'coincidences' occur consistently over one's life. Synchronicity is said to occur when one lives with more love, passion, truth or with just more awareness. 6. Die Still not convinced of life after death? Time to die! Just kidding. This life is made to be lived, not to be destroyed prematurely. People who have experienced the spirit realm during their Near Death Experience (with all it's glory, bliss and love) are told that their earthly life still matter and that it's not their time to pass on yet, so really, trust that you are here for a reason and make the best out of it, eternity needs no hurry and we can experience the same glory, bliss and love in this physical life, by learning to live with love and with awareness of the light already existing within us.