have an open mind

have an open mind

To avoid making a judgment or decision about things before thoroughly considering them. If you're not going to have an open mind about this, I don't see how we're going to have a productive discussion about it. 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.
See also: have, mind, open
Farlex Dictionary of Idioms.

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.
See also: have, keep, mind, open
Farlex Partner Idioms Dictionary
See also:
  • be one over (the) eight
  • don't bring a knife to a gunfight
  • think twice
  • think twice about
  • think twice about something/about doing something
  • think twice, to
  • no stranger to (something)
  • rubber stamp
  • be no stranger to (something)
  • be no/a stranger to something
References in periodicals archive
“Even if you have an open mind, sometimes you will need to ask more questions either to clarify or to share why you feel uncomfortable,” says Eder, the Time Management professional.
Finding Time's Solo-E Certified Expert Celebrates National Coaching Day
Those who are inclined to agree with her about this, or even to have an open mind on the question, probably will like her book.
Alternative traditions in early Christianity