Well, I don't speak Latin and know very little of it, mostly scientific. I'm having enough trouble just trying to improve my Russian. I just remember that quote from a long time back and thought it'd be good for someone who climbs solo, although the original quote is referring to highest authority rather than literal height, it still fits. Yours is interesting as well, not quite as catchy, though.
Whatever the best body type is, mine is definitely not it at 6'4" 280#. I'd imagine that conditioning is much more important than size, though. If you're used to walking long distances, carrying a lot of equipment, etc, you'll be a better climber and have an easier time at it. For example, someone the same size as me who just completed military training (yeah, they do exist, few and far between though) with long marches carrying a lot of gear, would find any climb much easier than I would. I'd imagine that the differences become magnified with age, though.
Summa sedes non capit duos