Still confused but I think I may have a glimmer of what you mean. Ok, perhaps you're trying to say he was "ahead of his time"? Ahh, well if that's the case then you have the pick of the litter from which to choose (France+Enlightenment=lots of good vocab)!
Perhaps try going simple: "Ses écritures étaient bien d'avant-garde"
or "Il était en avance sur son époque"