open mind
/ˌəʊp(ə)n ˈmʌɪnd/noun
A mind that is accessible or receptive, especially to new arguments or ideas; a candid or honest mind. Also (especially in later use): an unprejudiced mind. Frequently in to keep an open mind and variants: to be ready to consider a matter without prejudice.
Origin
Mid 18th century; earliest use found in Mark Akenside (1721–1770), poet and physician. From open + mind.
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