“The difference between a dreamer and a visionary is that a dreamer has his eyes closed and a visionary has his eyes open”
Source: I Have a Dream
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Martin Luther King, Jr. 658
American clergyman, activist, and leader in the American Ci… 1929–1968Related quotes

“The Outsider has his proper place in the Order of Society, as the impractical dreamer.”
Source: The Outsider (1956), Chapter Three, The Romantic Outsider
“Who has seen with their eyes open can see again, but with the eyes closed.”
Quien ha visto con los ojos abiertos, puede volver a ver, pero con los ojos cerrados.
Voces (1943)

Preface.
A History of Science Vol.1 Ancient Science Through the Golden Age of Greece (1952)
Context: Some men are abstract-minded, and they naturally think first of unity and God, of wholeness, of infinity and other such concepts, while the minds of other men are concrete and they cogitate about health and disease, profit and loss. They invent gadgets and remedies; they are less interested in knowing anything than in applying whatever knowledge... to practical problems... The first are called dreamers; the second kind are recognized as practical and useful. History has often proved the shortsightedness of the practical men and vindicated the "lazy" dreamers; it has also proved that the dreamers are often mistaken.

“Every closed eye is not sleeping, and every open eye is not seeing.”

“With open eyes, you watch; with closed eyes, you see.”
“A Book,” p. p. 92
The Creator (2000), Sequence: “Nostalgic Elements”

Introductory Chapter. Variant: This, therefore, is a faded dream of the time when I went down into the dust and noise of the Eastern market-place, and with my brain and muscles, with sweat and constant thinking, made others see my visions coming true. Those who dream by night in the dusty recesses of their minds wake in the day to find that all was vanity; but the dreamers of the day are dangerous men, for they may act their dream with open eyes, and make it possible.
Seven Pillars of Wisdom (1922)