Moralities and religions are the principal means by which one can make whatever one wishes out of man, provided one possesses a superfluity of creative forces and can assert one's will over long periods of time in the form of legislation and customs.
For such is man: a Theological Dogma might be refuted to him a thousand times - provided however, that he had need of it, he would again and again accept it as true. Belief is always most desired, most pressingly needed where there is a lack of will. Fanaticism is the sole "volitional strength" to which the weak and irresolute can be excited, as a sort of hypnotising of the entire sensory-intellectual system.
The task is not to overcome opponents in general but only those opponents against whom one has to summon all one's strength, one's skill and one's swordsmanship-in fact to master opponents who are one's equals.
Indeed, what forces us at all to suppose that there is an essential opposition of 'true' and 'false'? Is it not sufficient to assume degrees of apparentness and, as it were, lighter and darker shadows and shades of appearance- different 'values', to use the language of painters?