Source: Confessions of a Philosopher (1997), p. 157
Context: As Voltaire once remarked, "It is the privilege of the real genius, especially one who opens up a new path, to make great mistakes with impunity." The Copernican revolution brought about by Kant was, I think, the most important single turning point in the history of philosophy. For that reason there has been, ever since, a watershed in understanding between those who have taken his work on board and those who have not. For a good many of the problems he uncovered, the solutions he put forward have not stood the test of time, but his uncovering of the problems remains the most illuminating thing a philosopher has ever done. Because of the fundamental character of these problems, and because Kant did not solve them, confronting them has been the most important challenge to philosophy ever since.
“There is no important problem in any branch of philosophy which is not treated by Kant, and he never treated a problem without saying something illuminating and original about it. He was certainly wrong on many points of detail, and he may well be wrong in his fundamental principles; but, when all criticisms have been made, it seems to me that Kant’s failures are more important than most men’s successes.”
From Five Types of Ethical Theory (1930)
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C. D. Broad 11
English philosopher 1887–1971Related quotes
“Kant's critical philosophy is the most elaborate fit of panic in the history of the Earth.”
Source: The Thirst for Annihilation: Georges Bataille and Virulent Nihilism (1992), Chapter 1: "The death of sound philosophy", p. 1

Attributed in posthumous publications, Einstein and Religion (1999)
Context: It seems to me that the idea of a personal God is an anthropomorphic concept which I cannot take seriously. I feel also not able to imagine some will or goal outside the human sphere. My views are near to those of Spinoza: admiration for the beauty of and belief in the logical simplicity of the order and harmony which we can grasp humbly and only imperfectly. I believe that we have to content ourselves with our imperfect knowledge and understanding and treat values and moral obligations as a purely human problem—the most important of all human problems.
From a letter to Murray W. Gross (26 April 1947), p. 138

Quoted by Frederic Prokosch in Voices: A Memoir (1983)
Source: 1950s, "What is Semantics?", 1950, p. 6 ; as cited in: Schaff (1962;95)