That’s what I am always telling people.
Your own experience is the only proof you will ever need.
After that, there will be no doubt ever again.
A sceptic only remains a sceptic until he/she makes the experience.
After the experience, there are no more sceptics or believers.
Only knowers.
But because of the impact of the experience (it feels more realistic than anything you can experience on earth), most incarnated humans are not ready for it and their Higher Selves will often prevent their attempts from making the Out of Body experience so that the incarnational self does not jeopardize the incarnation and turns to escapism.
Also because of the impact of the experience is the reason why we “forget” about our astral life and everything else when we incarnate.
If you would remember, you wouldn’t want to stay in this extremely challenging environment (physical universe) and low vibe environment (human society).
This is true when you develop almost 100% real free will – a point at which one pretty much becomes their Higher Self version. Which is a point most astral travelers are still far away from.
But until then, thinking that one such experience, like for the guy above, will already give you that choice, is completely delusional and full of spiritual ego.
Taking one’s physical life is the biggest mistake one can ever make because the decision to do so comes from a fogged limited incarnational mind that is not able to grasp and understand the full scope and strategy of the Higher Self.
This person who wrote the letter made a profound spiritual experience, then thought “That’s it, I am enlightened!” and jeopardized his/hers incarnation acting from his/hers spiritual ego, not even properly consulting with his/hers Higher Self.
Instead of trying to understand the reasons and purpose of his/hers physical incarnation (e.g. by going out of body many more times and trying to speak to angels, spirit guides, his/hers Higher Self), the person just quickly decided to flee the physical plane with all types of rationalizations.
The only instance that should decide when you finally leave your physical incarnation is your Higher Self!
If you don’t know what the Higher Self has planned across the various timelines and incarnations then it would be stupid to make such a decision from a mindfogged earthly point of view.