“Every man has seen the wall that limits his mind.”
Tout homme a vu le mur qui borne son esprit.
Poèmes philosophiques, "La flute", line 108; (ed.) Paul Viallaneix Oeuvres complètes (1965) p. 103; translation from Jason Merchey Values of the Wise (2004) p. 200. (1843).
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Tout homme a vu le mur qui borne son esprit.
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Alfred De Vigny 11
French poet, playwright, and novelist 1797–1863Related quotes

“Every man takes the limits of his own field of vision for the limits of the world.”
"Psychological Observations"
Parerga and Paralipomena (1851), Studies in Pessimism
Variant: Everyone takes the limits of his own vision for the limits of the world.
Source: Studies in Pessimism: The Essays

“Every man has at times in his mind the Ideal of what he should be, but is not.”
"A Lesson for the Day; or The Christianity of Christ, of the Church, and of Society" in The Dial (October 1940), p. 196.
Context: Every man has at times in his mind the Ideal of what he should be, but is not. This ideal may be high and complete, or it may be quite low and insufficient; yet in all men, that really seek to improve, it is better than the actual character. Perhaps no one is satisfied with himself, so that he never wishes to be wiser, better, and more holy. Man never falls so low, that he can see nothing higher than himself.

“Let every man mind his own business.”
Source: Don Quixote de la Mancha (1605–1615), Part I, Book III, Ch. 8.

“A man’s at odds to know his mind cause his mind is aught he has to know it with.”
Blood Meridian (1985)
Source: Blood Meridian, or the Evening Redness in the West

“Every man has a right to his own opinion, but no man has a right to be wrong in his facts.”
Deming Headlight (New Mexico), 6 January 1950, as cited in the Yale Book of Modern Proverbs and at There Are Opinions, And Then There Are Facts; Freakonomics blog post by Fred R. Shapiro http://www.freakonomics.com/2011/08/18/there-are-opinions-and-then-there-are-facts/ (18 August 2011)