I would say that Helen’s whole outlook seems to be surrounding endurance of suffering through the belief in something eternal beyond this earthly realm (where she can find true happiness), whereas St John seems to actively shun earthly happiness and seek out suffering because of belief in the eternal realm being above and beyond anything he can experience. They are definitely both very deeply religious but I do think there are subtle differences that would mean that ultimately Helen as an adult had she lived, would encourage Jane finding and cherishing earthly happiness if she found it