Wow - that is quite a spectrum of contributors over there at Quora
The whole gamut.
I don't have much to add, really. Prayer seems to be another 'path' in the world of soul-making that our Father uses to help us focus our mind and desires, to help us develop "Till We Have Faces" (title of a C.S. Lewis novel), that is, until we know ourselves and speak to God as our true selves, not as a phony.
I really have lived in books. Books are friends. They are some of the friends that make you who you are.