Fanaticism (n.) is the lesser danger to morals, because it can never become the lasting state of many human beings.
Fanaticism (n.) is the delusion of willing to see beyond all bounds of sensibility — dreaming according to principles, rational raving.
Fanaticism (n.) can make headway in an enlightened age only by hiding behind school metaphysics, under whose protection it ventures to rave rationally.
Fanaticism (n.) is overstepping the bounds of human reason, and doing so on principle; moral fanaticism oversteps the bounds pure practical reason sets for humanity.
Fanaticism (n.) of the moral kind is bred by urging people to noble, sublime, magnanimous deeds: they come to think of goodness as merit rather than duty, and their self-conceit swells.
Fanaticism (n.) is to enthusiasm as mania to delirium: in enthusiasm imagination is unbridled, in fanaticism ungoverned; the first is a passing fit of the healthy, the second an undermining disease.