“Philosophers' Syndrome: mistaking a failure of the imagination for an insight into necessity.”

Part 4, Section 7
A Treatise of Human Nature (1739-40), Book 1: Of the understanding
Context: This deficiency in our ideas is not, indeed, perceived in common life, nor are we sensible, that in the most usual conjunctions of cause and effect we are as ignorant of the ultimate principle, which binds them together, as in the most unusual and extraordinary. But this proceeds merely from an illusion of the imagination; and the question is, how far we ought to yield to these illusions. This question is very difficult, and reduces us to a very dangerous dilemma, whichever way we answer it. For if we assent to every trivial suggestion of the fancy; beside that these suggestions are often contrary to each other; they lead us into such errors, absurdities, and obscurities, that we must at last become asham'd of our credulity. Nothing is more dangerous to reason than the flights of the imagination, and nothing has been the occasion of more mistakes among philosophers. Men of bright fancies may in this respect be compar'd to those angels, whom the scripture represents as covering their eyes with their wings. This has already appear'd in so many instances, that we may spare ourselves the trouble of enlarging upon it any farther.

Anti-Dühring, pt. 1, ch. 11 (1878)

Source: Sailing the Wine-Dark Sea: Why the Greeks Matter (2003), Ch.VII The Way They Went: Greco-Roman Meets Judeo-Christian
Context: No longer did philosophers aspire to the deep spiritual insights and broad moral vision of Socrates, Plato, and Aristotle. They divided into conflicting schools and wandered through the Greco-Roman world as permanent immigrants, picking up tutoring jobs as they could.... the upshot was a debased intellectual climate, fragmented and agnostic.

Saint Joan : A Chronicle Play In Six Scenes And An Epilogue (1923) - Full text online http://gutenberg.net.au/ebooks02/0200811h.html
1920s

Source: Wooden on Leadership: How to Create a Winning Organizaion

"The Way Of Chuang Tzu".
The Way of Chuang-Tzŭ (1965)
Context: The humor, the sophistication, the literary genius, and philosophical insight of Chuang Tzu are evident to anyone who samples his work. But before one can begin to understand even a little of his subtlety, one must situate him in his cul­tural and historical context. That is to say that one must see him against the background of the Confucianism which he did not hesitate to ridicule, along with all the other sedate and accepted schools of Chinese thought, from that of Mo Ti to that of Chuang's contemporary, friend, and constant op­ponent, the logician Hui Tzu. One must also see him in rela­tion to what followed him, because it would be a great mistake to confuse the Taoism of Chuang Tzu with the popular, de­ generate amalgam of superstition, alchemy, magic, and health­ culture which Taoism later became.
The true inheritors of the thought and spirit of Chuang Tzu are the Chinese Zen Buddhists of the Tang period (7th to 10th centuries A. D.). But Chuang Tzu continued to exert an influence on all cultured Chinese thought, since he never ceased to be recognized as one of the great writers and think­ ers of the classical period. The subtle, sophisticated, mystical Taoism of Chuang Tzu and Lao Tzu has left a permanent mark on all Chinese culture and on the Chinese character itself. There have never been lacking authorities like Daisetz T. Suzuki, the Japanese Zen scholar, who declare Chuang Tzu to be the very greatest of the Chinese philosophers. There is no question that the kind of thought and culture represented by Chuang Tzu was what transformed highly speculative Indian Buddhism into the humorous, iconoclastic, and totally practical kind of Buddhism that was to flourish in China and in Japan in the various schools of Zen. Zen throws light on Chuang Tzu, and Chuang Tzu throws light on Zen.

Speech to the First Protectorate Parliament (12 September 1654)

Source: Natural Right and History (1953), p. 116