Psychologists have hitherto failed to realize that imagination is a necessary ingredient of perception itself.
A philosophical attempt to work out a universal history according to a natural plan directed to achieving the civic union of the human race must be regarded as possible and, indeed, as contributing to this end of Nature.
Arrogance is, as it were, a solicitation on the part of one seeking honor for followers, whom he thinks he is entitled to treat with contempt.
Aristotle can be regarded as the father of logic. But his logic is too scholastic, full of subtleties, and fundamentally has not been of much value to the human understanding. It is a dialectic and an organon for the art of disputation.
I freely admit that the remembrance of David Hume was the very thing that many years ago first interrupted my dogmatic slumber and gave a completely different direction to my researches in the field of speculative philosophy.
All natural capacities of a creature are destined to evolve completely to their natural end.
Is it reasonable to assume a purposiveness in all the parts of nature and to deny it to the whole?
Thinking in pictures precedes thinking in words.
The universal and lasting establishment of peace constitutes not merely a part, but the whole final purpose and end of the science of right as viewed within the limits of reason.
Procrastination is hardly more evil than grasping impatience.
Man’s duty is to improve himself; to cultivate his mind; and, when he finds himself going astray, to bring the moral law to bear upon himself.
Apart from moral conduct, all that man thinks himself able to do in order to become acceptable to God is mere superstition and religious folly.
Maturity is having the courage to use one’s own intelligence.
I am an investigator by inclination. I feel a great thirst for knowledge.
The business of philosophy is not to give rules, but to analyze the private judgments of common reason.
The busier we are, the more acutely we feel that we live, the more conscious we are of life.
An action is essentially good if the motive of the agent be good, regardless of the consequences.
Enlightenment is man’s emergence from his self-incurred immaturity.
But only he who, himself enlightened, is not afraid of shadows.
In every department of physical science there is only so much science, properly so-called, as there is mathematics.