I believe that we don't know everything there is to know out there. I don't believe we die and that's it... I think there is something more.
A fundamental truth of Physics is that energy cannot be destroyed... you can only change its form.
Once I was in Hobby Lobby in the evening. there was no one within 20 feet of me. I heard a voice say "Hey" ... so I whispered back hello there... I didn't hear anything else. it was my brothers voice who passed 1 year earlier. I got home that night and checked my voicemail, my father called me to tell me that my uncle passed away. This uncle was my brother's favorite uncle.
Now i work in mental health. I know when someone is bat shit crazy. people who are mentally ill hear paranoid delusional voices... not voices that speak one or two coherent sentences. So I know I am not and was not mentally ill.