“Thoughts without content are empty, intuitions without concepts are blind.”

— Immanuel Kant , book Critique of Pure Reason

A 51, B 75
Source: Critique of Pure Reason (1781; 1787)
Context: Thoughts without content are empty, intuitions without concepts are blind. The understanding can intuit nothing, the senses can think nothing. Only through their unison can knowledge arise.

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Immanuel Kant 200

German philosopher 1724–1804

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This is declared to be "an old Kantian maxim" in General Systems Vol. 7-8 (1962)‎, p. 11, by the Society for the Advancement of General Systems Theory, but may simply be a paraphrase or summation of Kantian ideas.
Kant's treatment of the transcendental logic in the First Critique contains a portion, of which this quote may be an ambiguously worded paraphrase. Kant, claiming that both reason and the senses are essential to the formation of our understanding of the world, writes: "Without sensibility no object would be given to us, and without understanding none would be thought. Thoughts without content are empty, intuitions without concepts are blind (A51/B75)".
Disputed

“The Age of Empty Freedom … does not know that man must first through labour, industry, and art, learn how to know; but it has a certain fixed standard for all conceptions, and an established Common Sense of Mankind always ready and at hand, innate within itself and there present without trouble on its part;—and those conceptions and this Common Sense are to it the measure of the efficient and the real. It has this great advantage over the Age of Science, that it knows all things without having learned anything; and can pass judgment upon whatever comes before it at once and without hesitation,—without needing any preliminary evidence:—'That which I do not immediately comprehend by the conceptions which dwell within me, is nothing,'—says Empty Freedom.”

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Source: The Characteristics of the Present Age (1806), p. 20

“Thoughts without content are empty, intuitions without concepts are blind.”

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