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.
The heart of a Christian, like the moon, commonly suffers an eclipse when it is at the full, and that by the interposition of the earth.
We are taught by great actions that the universe is the property of every individual in it.
To deprive a gregarious creature of companionship is to maim it, to outrage its nature. The prisoner and the cenobite are aware that the herd exists beyond their exile; they are an aspect of it. But when the herd no longer exists, there is, for the herd creature, no longer entity, a part of no whole; a freak without a place. If he cannot hold on to his reason, then he is lost indeed; most utterly, most fearfully lost, so that he becomes no more than the twitch in the limb of a corpse.
To know God as the sovereign disposer of all good, inviting us to present our requests, and yet not to approach or ask of him, were so far from availing us, that it were just as if one told of a treasure were to allow it to remain buried in the ground.
We could not guard every water pipeline from being blown up and every tree from being uprooted. We could not prevent every murder of a worker in an orchard or a family in their beds. But it was in our power to set high price for our blood, a price too high for the Arab community, the Arab army, or the Arab governments to think it worth paying... It was in our power to cause the Arab governments to renounce 'the policy of strength' toward Israel by turning it into a demonstration of weakness.
Maybe the ultimate wound is the one that makes you miss the war you got it in.
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