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Phrase(s): mind over matter
Fig. [an instance where there are] intellectual powers overriding threats, difficulties, or problems. • You need to concentrate harder. Pay no attention to your surroundings. This is a case of mind over matter.
McGrawhill's American Idioms And Phrasal Verbs
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Willpower can overcome physical obstacles, as in Margaret was determined to go to the wedding even on crutches? mind over matter. This idea was already expressed by Virgil in the Aeneid (c. 19 B.C.) as Mens agitat molem, "Mind moves matter," and it appeared in various forms in English by 1700.
American Heritage Idioms