Genealogía de la Moral
First published 1887 · Spanish · 135 pages
- Philosophy
- Science and nature

The Spanish edition of Nietzsche's work on the origins of moral ideas, in three linked essays. He asks where concepts such as good and evil, guilt and conscience come from, and argues that they have a history rooted in power, resentment and cruelty.
The essays contrast noble and slavish values, examine guilt and punishment, and question why people have prized self-denial. It remains one of his most sustained and influential arguments.