noun
a word that represents a person, place, thing, or idea
preposition
a word that shows the relationship between a noun (or pronoun) and other words in a sentence
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The concept of perception being influenced by personal beliefs is often discussed as being all in the mind.
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She thinks studying for exams is all in the mind, but I believe in putting in the hard work.
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Some people say that success is all in the mind, but I think it's a mix of hard work and luck.
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Whether you believe you can achieve something or not, it's all in the mind and plays a big role in determining your success.