Human, All Too Human · Friedrich Wilhelm Nietzsche
104
If it extended further, that is, to our fellow men, we would never cause anyone else any pain (except in such cases as we cause it to ourselves, when we cut ourselves, surgically, to heal our ills, or strive and trouble ourselves to gain health). We conclude from analogy that something pains somebody and can in consequence, through recollection and the power of imagination, feel pain also. But what a difference there always is between the tooth ache and the pain (sympathy) that the spectacle of tooth ache occasions! Therefore when injury is inflicted from so called badness the degree of pain thereby experienced is always unknown to us: in so far, however, as pleasure is felt in the act (a sense of one's own power, of one's own excitation) the act is committed to maintain the well being of the individual and hence comes under the purview of self defence and lying for self preservation. Without pleasure, there is no life; the struggle for pleasure is the struggle for life. Whether the individual shall carry on this struggle in such a way that he be called good or in such a way that he be called bad is something that the standard and the capacity of his own intellect must determine for him.
Text from Project Gutenberg, public domain in the United States.