open mind

keep an open mind (about sth) AND have an open mind (about sth) (to wait until you know all the facts before forming an opinion or making a judgement ) — иметь напредвзятое мнение, объективное суждение; судить непредвзято, объективно; составить собственное мнение; не делать поспешних выводов

Example 1: You've got to keep your mind open.

Example 2: Toby might not be guilty - you should keep an open mind until after his case is heard in court.

also
[think outside the box]