I'll take that on.
No religious explanation - that is to explain the unexplainable - standard position of mine.
I believe that inspiration of others to the next generation or future generations may be pure transactive stimulation of the conscious or the unconscious, though I also am of the opinion may be that there may be energy forms/intellectual forms of energy transmission that we may have not yet tapped into.
For example, our ancestors could see St Elmo's Fire and feel static tricity - but could they explain it. So, I do believe that there are other mental channels to the transmission of ideas and experience that lie there in the 'grey' world, yet to be explored and understood.
Does this sound daft? Probably - but long continue rational (and irrational) research.