Had an open mind - Idioms by The Free Dictionary
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have an open mind
To avoid making a judgment or decision about someone or something without full knowledge. I know you think that Morton is a dullard, but try to have an open mind—once you get to know him better, you'll find that he's really quite funny.
have/keep an ˌopen ˈmind (on/about something) be willing to change your opinion (on/about something): I’ve still got an open mind on the question of nuclear defence. ▶ ˌopen-ˈminded adj.: You can talk to her about anything — she’s very open-minded.