Discrepancy between theory and practice, which in sound physical and mechanical science is a delusion, has a real existence in the minds of men; and that fallacy, through rejected by their judgments, continues to exert and influence over their acts.

Summary

This quote highlights the idea that there is often a disconnect between the theoretical understanding of something and its practical application. While physical and mechanical sciences strive for harmony between theory and practice, in the minds of individuals, this discrepancy exists. Even if people recognize the fallacy in their thinking, they are still influenced by it, causing their actions to deviate from what logic and knowledge would dictate. Thus, the quote suggests that despite rationality, human behavior is not always guided by logical reasoning.

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