"The only objects of practical reason are therefore those of good and evil. For by the former is meant an object necessarily desired according to a principle of reason; by the latter one necessarily shunned, also according to a principle of reason"
About this Quote
The phrasing “necessarily desired” and “necessarily shunned” is doing quiet but aggressive work. Kant isn’t describing what people happen to want (we clearly desire plenty of terrible things). He’s describing what a will committed to reason must will, on pain of contradiction. The necessity here is normative: if you accept reason’s authority, you’re already committed to treating certain ends as mandatory and others as forbidden.
That subtext is a rebuttal to moral sentimentalism and to any ethics that smuggles in “the good” as whatever satisfies us. Kant is also narrowing the field: practical reason doesn’t take orders from appetites, theology, or utilitarian calculus. It legislates. “According to a principle of reason” hints at the larger Kantian engine: maxims, universalizability, and the idea that moral law is self-imposed by rational agents rather than handed down by preference or power.
Historically, this sits in the Enlightenment project of grounding ethics without relying on tradition. It works rhetorically because it sounds almost administrative, then lands like a coup: morality isn’t an add-on to life; it’s what reason is for, once it steps off the page and into action.
Quote Details
| Topic | Ethics & Morality |
|---|---|
| Source | Immanuel Kant, Groundwork of the Metaphysics of Morals (Grundlegung zur Metaphysik der Sitten), 1785 — Section I (standard English translations render this passage in the opening argument on practical reason and the objects of good and evil). |
| Cite |
Citation Formats
APA Style (7th ed.)
Kant, Immanuel. (2026, January 17). The only objects of practical reason are therefore those of good and evil. For by the former is meant an object necessarily desired according to a principle of reason; by the latter one necessarily shunned, also according to a principle of reason. FixQuotes. https://fixquotes.com/quotes/the-only-objects-of-practical-reason-are-34041/
Chicago Style
Kant, Immanuel. "The only objects of practical reason are therefore those of good and evil. For by the former is meant an object necessarily desired according to a principle of reason; by the latter one necessarily shunned, also according to a principle of reason." FixQuotes. January 17, 2026. https://fixquotes.com/quotes/the-only-objects-of-practical-reason-are-34041/.
MLA Style (9th ed.)
"The only objects of practical reason are therefore those of good and evil. For by the former is meant an object necessarily desired according to a principle of reason; by the latter one necessarily shunned, also according to a principle of reason." FixQuotes, 17 Jan. 2026, https://fixquotes.com/quotes/the-only-objects-of-practical-reason-are-34041/. Accessed 12 Feb. 2026.












