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Morality makes stupid.  Custom represents the experiences of men of earlier times as to what they supposed useful and harmful  but the sense for custom (morality) applies, not to these experiences as such, but to the age, the sanctity, the indiscussability of the custom. And so this feeling is a hindrance to the acquisition of new experiences and the correction of customs: that is to say, morality is a hindrance to the creation of new and better customs: it makes stupid.