A hallucination is a fact, not an error; what is erroneous is a judgment based upon it.
Interpretation
Hallucinations are real experiences, and judging them as mistakes is where the error lies.
Bertrand Russell's quote suggests that hallucinations, while perhaps not aligned with reality, are genuine experiences that should be recognized as such. The true error occurs when one makes erroneous judgments about these experiences, potentially dismissing significant insights they may offer or misunderstanding the nature of perception and reality.
In practice
In a lecture about the nature of reality and perception, this quote can illustrate how personal experiences shape our understanding.
St. Paul introduced an entirely novel view of marriage, that it existed primarily to prevent the sin of fornication. It is just as if one were to maintain that the sole reason for baking bread is to prevent people from stealing cake.
Freedom comes only to those who no longer ask of life that it shall yield them any of those personal goods that are subject to the mutations of time.
Of these austerer virtues the love of truth is the chief, and in mathematics, more than elsewhere, the love of truth may find encouragement for waning faith. Every great study is not only an end in itself, but also a means of creating and sustaining a lofty habit of mind; and this purpose should be kept always in view throughout the teaching and learning of mathematics.
At all times, except when a monarch could enforce his will, war has been facilitated by the fact that vigorous males, confident of victory, enjoyed it, while their females admired them for their prowess.
Moreover, the attitude that one ought to believe such and such a proposition, independently of the question whether there is evidence in its favor, is an attitude which produces hostility to evidence and causes us to close our minds to every fact that does not suit our prejudices.
Extreme hopes are born from extreme misery.
There is no virtue higher than non-injury.
Identitarianism assumes that people are condemned to identify with the positive (ethnic/ gender/ nationalistic) predicates they possess, as if their subjectivity were exhausted by those properties. Exactly the opposite is the case: the authentic dimension of subjectivity consists not in any positive identity but in that which makes identifications.
Here is a law which is above the King and which even he must not break. This reaffirmation of a supreme law and its expression in a general charter is the great work of Magna Carta; and this alone justifies the respect in which men have held it
we are the lords of all eternity
Is this a dagger which I see before me, _x000D_ _x000D_ The handle toward my hand? Come, let me clutch thee. _x000D_ _x000D_ I have thee not, and yet I see thee still. _x000D_ _x000D_ Art thou not, fatal vision, sensible _x000D_ _x000D_ To feeling as to sight? or art thou but _x000D_ _x000D_ A dagger of the mind, a false creation, _x000D_ _x000D_ Proceeding from the heat-oppressed brain?
Memory is the scribe of the soul.
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