- How sure this is
- 88% sureThese words were traced back to where they first appeared. That source is listed below.
- What turned up
- Twilight of the Idols, "Maxims and Arrows," §12, 1888 — Wikiquote's phrasing is a paraphrase popularized via Viktor Frankl; Ludovici's own primary translation (Project Gutenberg) confirms the same aphorism at the same position, in different wording.