"So long as a man imagines that he cannot do this or that, so long as he is determined not to do it; and consequently so long as it is impossible to him that he should do it"
About this Quote
That’s classic Spinoza: the stoic clarity without the self-help haze. In the Ethics, he argues that humans mistake their desires and aversions for free choice, then retrofit reasons to justify what they were already inclined to do. This line is a miniature of that system. “Imagination” is his key term for half-knowledge - vivid, persuasive, and often wrong. It doesn’t just mislead; it organizes behavior. You don’t merely believe you’re incapable, you quietly choose the identity of “the person who can’t,” and the world obediently shrinks to fit.
The subtext is bracingly anti-romantic: inner limitation is frequently a form of commitment. Spinoza isn’t denying real constraints; he’s indicting the way we collaborate with them, converting fear into principle. The sentence feels repetitive because the mechanism is repetitive: thought becomes resolve, resolve becomes fate. That’s the critique, and the warning.
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Citation Formats
APA Style (7th ed.)
Spinoza, Baruch. (2026, January 15). So long as a man imagines that he cannot do this or that, so long as he is determined not to do it; and consequently so long as it is impossible to him that he should do it. FixQuotes. https://fixquotes.com/quotes/so-long-as-a-man-imagines-that-he-cannot-do-this-62708/
Chicago Style
Spinoza, Baruch. "So long as a man imagines that he cannot do this or that, so long as he is determined not to do it; and consequently so long as it is impossible to him that he should do it." FixQuotes. January 15, 2026. https://fixquotes.com/quotes/so-long-as-a-man-imagines-that-he-cannot-do-this-62708/.
MLA Style (9th ed.)
"So long as a man imagines that he cannot do this or that, so long as he is determined not to do it; and consequently so long as it is impossible to him that he should do it." FixQuotes, 15 Jan. 2026, https://fixquotes.com/quotes/so-long-as-a-man-imagines-that-he-cannot-do-this-62708/. Accessed 10 Feb. 2026.












