"In the animal kingdom, the rule is, eat or be eaten; in the human kingdom, define or be defined"
About this Quote
The line lands because it treats “definition” as an act of power, not a neutral description. To define someone is to pre-load the verdict: sane or insane, responsible or sick, criminal or patient. Once a definition hardens, institutions follow. Courts defer. Families rearrange their expectations. Employers and schools translate the label into opportunity or exclusion. Szasz’s subtext is that modern coercion often arrives with a clipboard and a caring tone.
Context matters: Szasz became famous by attacking mainstream psychiatry, especially its authority to classify and confine. In The Myth of Mental Illness and related work, he argued that psychiatric diagnoses frequently operate like moral and political judgments dressed up as medical facts. So “define or be defined” isn’t self-help advice about personal branding; it’s a warning about bureaucratic capture. If you don’t narrate yourself, a hospital chart, a DSM category, or a judge’s phrase will do it for you.
The irony is that definition is unavoidable. Humans need categories to coordinate reality. Szasz’s sting is aimed at the moment categories become cages - when naming stops being understanding and starts being control.
Quote Details
| Topic | Wisdom |
|---|---|
| Source | Unverified source: Words to the Wise (Thomas Szasz, 2004)
Evidence: Page 65. Primary-source attribution in multiple places points to Szasz’s own book *Words to the Wise: A Medical-Philosophical Dictionary* (Transaction Publishers, 2004), where the quote is given on p.65. This is the earliest specific publication I could verify with a concrete page citation during... Other candidates (2) Thomas Szasz (Thomas Szasz) compilation98.7% sin 1973 in the animal kingdom the rule is eat or be eaten in the human kingdom define or be defined p 20 boredo Wisdom for the Soul (Larry Chang, 2006) compilation95.0% ... In the animal kingdom, the rule is, eat or be eaten; in the human kingdom, define or be defined. ~ Thomas Szasz, ... |
| Cite |
Citation Formats
APA Style (7th ed.)
Szasz, Thomas. (2026, January 13). In the animal kingdom, the rule is, eat or be eaten; in the human kingdom, define or be defined. FixQuotes. https://fixquotes.com/quotes/in-the-animal-kingdom-the-rule-is-eat-or-be-eaten-91170/
Chicago Style
Szasz, Thomas. "In the animal kingdom, the rule is, eat or be eaten; in the human kingdom, define or be defined." FixQuotes. January 13, 2026. https://fixquotes.com/quotes/in-the-animal-kingdom-the-rule-is-eat-or-be-eaten-91170/.
MLA Style (9th ed.)
"In the animal kingdom, the rule is, eat or be eaten; in the human kingdom, define or be defined." FixQuotes, 13 Jan. 2026, https://fixquotes.com/quotes/in-the-animal-kingdom-the-rule-is-eat-or-be-eaten-91170/. Accessed 9 Feb. 2026.











