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.
Almost anything that you pay close, direct attention to becomes interesting.
But I know what darkness is, it accumulates, thickens, then suddenly bursts and drowns everything.
All those evil doctrines about God that work misery and madness have their origin in the brains of the wise and prudent, not in the hearts of children.
For nothing so much disturbs the mind, though it be done for some beneficial purpose, as to innovate and introduce strange things, and most of all when this is done in matters relating to divine worship and the glory of God.
Religion and science are the two conjugated faces or phases of one and the same complete act of knowledge - the only one which can embrace the past and future of evolution and so contemplate, measure and fulfil them.
The clearest sensation that a human being has when he experiences the holy is an overpowering and overwhelming sense of creatureliness. That is, when we are in the presence of God, we are humbled and become most aware of ourselves as creatures. This is the opposite of Satan's original temptation, "You shall be as gods.
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