“What is commonly called liberality is the condition of being open, available to all truths. But this is precisely eclecticism, confusion, the absence of integrity.”

They are the brute beasts of the intellectual domain.
The Autocrat of the Breakfast Table (1858)

1940s, Philosophy for Laymen (1946)
Context: Knowledge is not so precise a concept as is commonly thought. Instead of saying “I know this,” we ought to say “I more or less know something more or less like this.” It is true that this proviso is hardly necessary as regards the multiplication table, but knowledge in practical affairs has not the certainty or the precision of arithmetic. Suppose I say “democracy is a good thing”: I must admit, first, that I am less sure of this than I am that two and two are four, and secondly, that “democracy” is a somewhat vague term which I cannot define precisely. We ought to say, therefore: “I am fairly certain that it is a good thing if a government has something of the characteristics that are common to the British and American Constitutions,” or something of this sort. And one of the aims of education ought to be to make such a statement more effective from a platform than the usual type of political slogan.

The Autocrat of the Breakfast Table (1858)

Source: The Reign of Quantity and Signs of the Times (1945), p. 289

Dorothy Thompson’s Political Guide: A Study of American Liberalism and its Relationship to Modern Totalitarian States (1938)
Source: A Study of American Liberalism and its Relationship to Modern Totalitarian States (1938)
p. 62

Source: " The Poet of Pessimism https://www.henrysalt.co.uk/library/essay/the-poet-of-pessimism/", Vegetarian Review, August 1896
Context: We work for an ideal, not because we believe the ideal is destined to be triumphant, but because we are impelled so to work, and cannot, without violence to our best instincts, act otherwise. We protest against cruelty and injustice for the same reason, not merely because we feel that the dawn of a better day is at hand, but because such a protest has to be made, and we know intuitively that we must help to make it. Of the event we can have no absolute assurance—it rests for other minds and other hands than our—but we can at least be assured that we have done what was natural and inevitable to us, and that, whether successful or unsuccessful, there was no other course for a thoughtful man to take.

Address to the Society for Psychical Research (1897)
Context: These rays, as generated in the vacuum tube, are not homogeneous, but consist of bundles of different wave-lengths, analogous to what would be differences of colour could we see them as light. Some pass easily through flesh, but are partially arrested by bone, while others pass with almost equal facility through bone and flesh.
It seems to me that in these rays we may have a possible mode of transmitting intelligence which, with a few reasonable postulates, may supply a key to much that is obscure in psychical research. Let it be assumed that these rays, or rays even of higher frequency, can pass into the brain and act on some nervous center there. Let it be conceived that the brain contains a center which uses these rays as the vocal chords use sound vibrations (both being under the command of intelligence), and sends them out, with the velocity of light, to impinge on the receiving ganglion of another brain. In this way some, at least, of the phenomena of telepathy, and the transmission of intelligence from one sensitive to another through long distances, seem to come into the domain of law and can be grasped. A sensitive may be one who possesses the telepathic transmitting or receiving ganglion in an advanced state of development, or who, by constant practice, is rendered more sensitive to these high-frequency waves. Experience seems to show that the receiving and the transmitting ganglions are not equally developed; one may be active, while the other, like the pineal eye in man, may be only vestigial. By such an hypothesis no physical laws are violated; neither is it necessary to invoke what is commonly called the supernatural.