Stranger in a Strange Land - the book that probably is most recognizable as R.A.Heinlein.. a "modern day messiah" - boy born on Mars and raised by martians until found 20 years later and brought "home".. the term "Grok" and the phrase "Thou Art God" come from here. i have read this book too, and loved it. "thou art god" is something of what i believe, in fact it is very very close to my beliefs.