The bottom line, made explicitly by this commentary (although attributed to only one component), is that various good design choices (improved over its over 60 years!!) make lisp very close to the language of thought and of natural expression. You can almost turn the natural expression of your computation directly into lisp by judicious use of parens and reading the phrase “of the” between function names and arguments, and where you can’t do this, that’s a hint that you need a macro.