, as I conceive of it. The power of moral prejudices has penetrated deeply into the most intellectual world, the world apparently most indifferent and unprejudiced, and has obviously operated in an injurious, obstructive, blinding, and distorting manner. A proper physio-psychology has to contend with unconscious antagonism in the heart of the investigator, it has “the heart” against it: even a doctrine of the reciprocal conditionalness of the “good” and the “bad” impulses, causes (as refined immorality) distress and aversion in a still strong and manly conscience⁠—still more so, a doctrine of the derivation of all good impulses from bad ones. If, however, a person should regard even the emotions of hatred, envy, covetousness, and imperiousness as life-conditioning emotions, as factors which must be present, fundamentally and essentially, in the general economy of life (which must, therefore, be further developed if life is to be further developed), he will suffer from such a view of things as from seasickness. And yet this hypothesis is far from being the strangest and most painful in this immense and almost new domain of dangerous knowledge, and there are in fact a hundred good reasons why everyone should keep away from it who can