“Man can hardly even recognize the devils of his own creation.”

Lecture I. Introductory.
A Treatise on Language: Or, The Relation which Words Bear to Things, in Four Parts (1836)
Context: Man exists in a world of his own creation. He cannot step, but on ground transformed by culture; nor look, but on objects produced by art. The animals which constitute his food are unknown to nature, while trees, fruits, and herbs, are the trophies of his labour. In himself nearly every natural impulse is suppressed as vicious, and every mortification solicited as a virtue. His language, actions, sentiments, and desires are nearly all factitious. Stupendous in achievement, he is boundless in attempt. Having subdued the earth's surface, he would explore its centre; having vanquished diseases, he would subdue death. Unsatisfied with recording the past, he would anticipate the future. Uncontented with subjugating the ocean, he would traverse the air. Success but sharpens his avidity, and facility but augments his impatience.

Section 1, member 3.
The Anatomy of Melancholy (1621), Part III

Life Without Principle (1863)
Context: I hardly know an intellectual man, even, who is so broad and truly liberal that you can think aloud in his society. Most with whom you endeavor to talk soon come to a stand against some institution in which they appear to hold stock, — that is, some particular, not universal, way of viewing things.

Source: The Bhagavadgītā (1973), p. 43. (23. Man)

Neverness (1988)

Man in the Modern Age (1933)